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21 tháng 9 2025

cứu j

28 tháng 9 2025

j

22 tháng 4 2020

Điền đúng động từ trong ngoặc:

1. I (understand)____would understand__Mr Brown if he (speak)___spoke__ slowly

2. 1. If you (see)____see___John, I ( tell) __will tell____him your news.

24 tháng 3 2025

Ch. Hcgic

Choose A, B, C, or D to complete the sentences. 1. Solar energy doesn’t cause __________. A. pollution B. polluted C. pollute D. pollutant 2. “What’s on TV tonight?” she asked. She asked me _____ . A. what was on TV that night B. what on TV that night was C. what is on TV tonight D. what is on TV that night 3. The kids didn’t go to the movie last night _________ it rained very heavily. A. and B. but C. as D. now 4. Dynamite _________ many years ago. A. has...
Đọc tiếp

Choose A, B, C, or D to complete the sentences.

1. Solar energy doesn’t cause __________.

A. pollution B. polluted C. pollute D. pollutant

2. “What’s on TV tonight?” she asked. She asked me _____ .

A. what was on TV that night B. what on TV that night was

C. what is on TV tonight D. what is on TV that night

3. The kids didn’t go to the movie last night _________ it rained very heavily.

A. and B. but C. as D. now

4. Dynamite _________ many years ago.

A. has invented B. invented C. was invented D. were invented

5. -“You are a great dancer, Doris!” -“Thanks, Rita_________.”

A. Let’s have a celebration B. I’m an awful dancer

C. That’s very nice of you to say so D. Well done!

6. If you know where she lives, please let me _____________.

A. know B. knew C. known D. to know

7. Ba is pleased __________his English is improving day-by-day.

A. but B. so C. although D. that

8. If we ______ wasting water , there will be shortage of fresh water in a few decades .

A.turn on B.turn off C.go on D.look for

9. “ ___________” means a piece of land full of rubbish.

A. Stream B. Treasure C. Hedge D. Junkyard

10. He shouted and looked __________ at me when I broke the vase.

A. angry B. angrier C. angrily D. angryly

11. Unless you understand, I ______ explain it again to you.

A. am B. will C. was D. would

12. My sister studied hard, ________ she completed her exam successfully.

A. although B. because C. as D. so

13. It’s very kind______you______say so!

A. of/ to B. to/ to C. with/ to D. from/ to

14. I / think / we / turn / light / before / leaving / room.

  1. I think we should turn the light before leaving the room.
  2. I think we should turn off the light before leaving the room.
  3. I think we should turn off light before leaving the room.
  4. I think we should turn off the light before leaving room.

15. People want to live in the city. However, ______________.

A. the city was very expensive B. the city were very expensive

C. the city is very expensive D. the city are very expensive

16. Most of the students are__________ to pass the exam.

A. good enough B. enough good C. too good D. so good

17. Jane wishes she ______________ a Miss World.

A. is B. were C. be D. will be

18. Jane suggested ___________ a dictionary.

A. that buying B. me buying C. that I should buy D. to buy

19. The girl ___________ is my sister.

A. who won the race B. whom won the race

C. won the race D. that the race won

1
19 tháng 6 2020

Choose A, B, C, or D to complete the sentences.

1. Solar energy doesn’t cause __________.

A. pollution B. polluted C. pollute D. pollutant

2. “What’s on TV tonight?” she asked. She asked me _____ .

A. what was on TV that night B. what on TV that night was

C. what is on TV tonight D. what is on TV that night

3. The kids didn’t go to the movie last night _________ it rained very heavily.

A. and B. but C. as D. now

4. Dynamite _________ many years ago.

A. has invented B. invented C. was invented D. were invented

5. -“You are a great dancer, Doris!” -“Thanks, Rita_________.”

A. Let’s have a celebration B. I’m an awful dancer

C. That’s very nice of you to say so D. Well done!

6. If you know where she lives, please let me _____________.

A. know B. knew C. known D. to know

7. Ba is pleased __________his English is improving day-by-day.

A. but B. so C. although D. that

8. If we ______ wasting water , there will be shortage of fresh water in a few decades .

A.turn on B.turn off C.go on D.look for

9. “ ___________” means a piece of land full of rubbish.

A. Stream B. Treasure C. Hedge D. Junkyard

10. He shouted and looked __________ at me when I broke the vase.

A. angry B. angrier C. angrily D. angryly

11. Unless you understand, I ______ explain it again to you.

A. am B. will C. was D. would

12. My sister studied hard, ________ she completed her exam successfully.

A. although B. because C. as D. so

13. It’s very kind______you______say so!

A. of/ to B. to/ to C. with/ to D. from/ to

14. I / think / we / turn / light / before / leaving / room.

  1. I think we should turn the light before leaving the room.
  2. I think we should turn off the light before leaving the room.
  3. I think we should turn off light before leaving the room.
  4. I think we should turn off the light before leaving room.

15. People want to live in the city. However, ______________.

A. the city was very expensive B. the city were very expensive

C. the city is very expensive D. the city are very expensive

16. Most of the students are__________ to pass the exam.

A. good enough B. enough good C. too good D. so good

17. Jane wishes she ______________ a Miss World.

A. is B. were C. be D. will be

18. Jane suggested ___________ a dictionary.

A. that buying B. me buying C. that I should buy D. to buy

19. The girl ___________ is my sister.

A. who won the race B. whom won the race

C. won the race D. that the race won

#trannguyenbaoquyen

I. PASSIVE VOICE(Present simple, Modal verbs)1. Linda will not take her son to the market.→ Linda’s son will _________________________________.2. Pele has to score a goal.→ A goal __________________________________________.3. You should correct this exercise carefully.→ This exercise ______________________________________.4. We ought to recycle waste paper to save money.→ Waste paper ____________________________________.5. I do every question from the book.→...
Đọc tiếp

I. PASSIVE VOICE(Present simple, Modal verbs)

1. Linda will not take her son to the market.

→ Linda’s son will _________________________________.

2. Pele has to score a goal.

→ A goal __________________________________________.

3. You should correct this exercise carefully.

→ This exercise ______________________________________.

4. We ought to recycle waste paper to save money.

→ Waste paper ____________________________________.

5. I do every question from the book.

→ Every question from _________________________________.

6. I make some coffee for my father everyday.

→ Some ___________________________________.

7. We will send you your examination results.

→ You ________________________________.

8. They feed the animals twice a day.

→ The animals ___________________________________.

9. They can’t hold the meeting in that room.

→ The meeting ____________________________________.

10. Mr. Tan has to repair this car.

¦ This car_______________________________

3
15 tháng 12 2016

1. Linda will not take her son to the market.

→ Linda’s son will not be taken to the market.

2. Pele has to score a goal.

→ A goal has to be scored by Pele

3. You should correct this exercise carefully.

→ This exercise should be corrected carefully.

4. We ought to recycle waste paper to save money.

→ Waste paper ought to be recycled to save money by us.

5. I do every question from the book.

→ Every question from the book is done by me.

6. I make some coffee for my father everyday.

→ Some coffee is made for my father everyday.

7. We will send you your examination results.

→ You will be sent your examination results.

8. They feed the animals twice a day.

→ The animals are feed twice a day by them.

9. They can’t hold the meeting in that room.

→ The meeting can't be hold in that room.

10. Mr. Tan has to repair this car.

---> This car has to be repaired by Mr.Tan

15 tháng 12 2016

1. Linda will not take her son to the market.

→ Linda’s son will not be taken to the market by her.

2. Pele has to score a goal.

→ A goal has to be scored by Pele.

3. You should correct this exercise carefully.

→ This exercise should be corrected carefully by you.

4. We ought to recycle waste paper to save money.

→ Waste paper ought to be recycled to save money by us.

5. I do every question from the book.

→ Every question from the book is done by me.

6. I make some coffee for my father everyday.

→ Some coffee is made for my father by me everyday.

7. We will send you your examination results.

→ You will be sent your examination results by us.

8. They feed the animals twice a day.

→ The animals were fed twice a day.

9. They can’t hold the meeting in that room.

→ The meeting can't be held in that room.

10. Mr. Tan has to repair this car.

-> This car has to be repaired by Mr.Tan.

1. What a pity I can’t speak French.→ I wish ____________________________________.2. It is such a pity that I don’t have a bike.→ I wish ______________________________________.3. I’m not able to ride a motorbike.→ I wish ___________________________________.4. I am sorry that I can’t remember the title of the book.→ I wish ________________________________.5. It’s a pity I don’t know where he is.→ I wish ____________________________________.6. ...
Đọc tiếp

1. What a pity I can’t speak French.

→ I wish ____________________________________.

2. It is such a pity that I don’t have a bike.

→ I wish ______________________________________.

3. I’m not able to ride a motorbike.

→ I wish ___________________________________.

4. I am sorry that I can’t remember the title of the book.

→ I wish ________________________________.

5. It’s a pity I don’t know where he is.

→ I wish ____________________________________.

6. I’m afraid I won’t see you off at the airport.

→ I wish _____________________________________.

7. I don’t have enough time to finish my homework.

→ I wish _____________________________________.

8. It seems that there isn’t enough food for us to eat.

→ We wish __________________________________.

9. John doesn’t help his wife with housework.

→ I wish ______________________________________.

10. She doesn’t go to China with us.

→ She wishes _________________________________.

11. It takes you very long to go to school.

→ I wish _________________________________.

12. I am sorry. I can’t answer all the questions.

¦ I wish___________________________________.

13. We don’t have a TV to watch the soccer match.

¦ We wish___________________________________________.

14. The weather is so bad today.

¦ I wish_______________________________________________.

15. There isn’t any tree in my garden.

¦ I wish _______________________________________________.

16. Her mother isn’t here with her now.

¦ She wishes_____________________________________.

17. My little daughter always makes noise when she comes back home.

¦ We wish___________________________________.

18. I’m sorry.I can’t go to Vung tau with you this weekend.

¦ I wish_______________________________________________.

19. My naughty friend always jokes me .

¦ He wishes_______________________________________.

20. It’s a pity that you are not free now .

¦ I wish______________________________________________.

#♪ ♀ ♡Băng♥Ciuღ ♂ ♫

2
15 tháng 12 2016

1. What a pity I can’t speak French.

→ I wish I could speak French.

2. It is such a pity that I don’t have a bike.

→ I wish I had a bike.

3. I’m not able to ride a motorbike.

→ I wish I was able to ride a motorbike

4. I am sorry that I can’t remember the title of the book.

→ I wish I could remember the title of the book.

5. It’s a pity I don’t know where he is.

→ I wish I knew where he is.

6. I’m afraid I won’t see you off at the airport.

→ I wish I would see you off at the airport.

7. I don’t have enough time to finish my homework.

→ I wish I had enough time to finish my homework.

8. It seems that there isn’t enough food for us to eat.

→ We wish there was enough food for us to eat.

9. John doesn’t help his wife with housework.

→ I wish John helped his wife with housework.

10. She doesn’t go to China with us.

→ She wishes she went to China with us.

11. It takes you very long to go to school.

→ I wish it didn't take you very long to go to school.

12. I am sorry. I can’t answer all the questions.

¦ I wish I could answer all the questions.

13. We don’t have a TV to watch the soccer match.

¦ We wish we had a TV to watch the soccer match.

14. The weather is so bad today.

¦ I wish the weather wasn't so bad today.

15. There isn’t any tree in my garden.

¦ I wish there were some trees in my garden.

16. Her mother isn’t here with her now.

¦ She wishes her mother were here with her now.

17. My little daughter always makes noise when she comes back home.

¦ We wish our little daughter wouldn't make noise when she comes back home.

18. I’m sorry.I can’t go to Vung tau with you this weekend.

¦ I wish I could go to Vung Tay with you this weekend.

19. My naughty friend always jokes me .

¦ He wishes my naughty friend wouldn't joke me.

20. It’s a pity that you are not free now .

¦ I wish you were free now.

22 tháng 12 2016

-Bạn@Trịnh Đức Minh bạn xem lại câu 05 xem có nhầm chút gì không bạn.

Mình nghĩ câu này viết lại thế này:I wish I knew where he was.

-Còn câu 08 và câu 14 bạn làm sai mất cái cấu trúc ngữ pháp đơn giản nhất rồi đó:I wish không đi với WAS mà đi với WERE mà!

Bạn giỏi vậy mà cũng nhầm ...đi thi thế này thì mình tiếc mãi mất!

Comment vậy thôi, rút kinh nghiệm nha!ok

♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧♡ღ☼★✿✦✧I-Fill in each blank with a correct reflexive pronoun.1. My sister often looks at ________ in the mirror.2. Mark made _______ a sandwich.3. This refrigerator defrosts ________.4. Hoa and I ________ saw that accident yesterday.5. Did you pay for ________?.6. The...
Đọc tiếp

★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦

I-Fill in each blank with a correct reflexive pronoun.

1. My sister often looks at ________ in the mirror.

2. Mark made _______ a sandwich.

3. This refrigerator defrosts ________.

4. Hoa and I ________ saw that accident yesterday.

5. Did you pay for ________?.

6. The children can look after __________ for a few days.

7. Please help me. I can't do it _____________.

8. Take care of ____________ ?.

9. He was very surprised when he looked ____________ in the mirror.

10. I don't like going to the cinema with other people. I prefer going by _________.

11. The child had no bothers or sisters, so she often had to play by _________.

12. I'm afraid that the children are going to cut __________ on the broken glass.

13. We had a great time in London together. We really enjoyed __________.

14. "Can I take another biscuit?"-Of course. Help _____________.

15. Don't worry about Linh and me. We can look after ___________.

16. I gave them a key to our house so that they could let __________ in.

17. Phuong had a great holiday. She enjoyed ___________.

18. Please try and understand how I feel. Put ___________ in my position.

19. I taught __________ to play the guitar. I have never had lessons.

20. An elephant hurt ______ when I tried to get out of the zoo yesterday.

21. I don't need any help. I can take care of __________.

22. Sarah and I didn't enjoy _________ at the disco last night.

23. This exercise isn't very difficult. Do it _____________.

24. My brother can repair the bicycle __________.

"Giải giúp tớ nhé!"-"Gấp lắm"-"Sắp nộp bài rồi"-"Nhưng không biết làm"

★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦✧♡★✿✦

2
25 tháng 7 2016

1. My sister often looks at herself in the mirror.

2. Mark made himself a sandwich.

3. This refrigerator defrosts itself.

4. Hoa and I ourselves saw that accident yesterday.

5. Did you pay for yourself?.

6. The children can look after themselves for a few days.

7. Please help me. I can't do it myself.

8. Take care of myself ?.

9. He was very surprised when he looked himself in the mirror.

10. I don't like going to the cinema with other people. I prefer going by myself.

11. The child had no bothers or sisters, so she often had to play by herself.

12. I'm afraid that the children are going to cut themselves on the broken glass.

13. We had a great time in London together. We really enjoyed ourselves.

14. "Can I take another biscuit?"-Of course. Help myself.

15. Don't worry about Linh and me. We can look after ourselves.

16. I gave them a key to our house so that they could let themselves in.

17. Phuong had a great holiday. She enjoyed herself.

18. Please try and understand how I feel. Put yourself in my position.

19. I taught myself to play the guitar. I have never had lessons.

20. An elephant hurt itself when I tried to get out of the zoo yesterday.

21. I don't need any help. I can take care of myself.

22. Sarah and I didn't enjoy ourselves at the disco last night.

23. This exercise isn't very difficult. Do it yourself.

24. My brother can repair the bicycle himself.

25 tháng 7 2016

1. My sister often looks at herself in the mirror.

2. Mark made himself a sandwich.

3. This refrigerator defrosts itself.

4. Hoa and I ourself saw that accident yesterday.

5. Did you pay for yourself?.

6. The children can look after themselves for a few days.

7. Please help me. I can't do it myself.

8. Take care of myself?.

9. He was very surprised when he looked himself in the mirror.

10. I don't like going to the cinema with other people. I prefer going by myself.

11. The child had no bothers or sisters, so she often had to play by itself.

12. I'm afraid that the children are going to cut themselves on the broken glass.

13. We had a great time in London together. We really enjoyed ourselves.

14. "Can I take another biscuit?"-Of course. Help yourself.

15. Don't worry about Linh and me. We can look after ourselves.

16. I gave them a key to our house so that they could let themselves in.

17. Phuong had a great holiday. She enjoyed hershelf.

18. Please try and understand how I feel. Put yourself in my position.

19. I taught myself to play the guitar. I have never had lessons.

20. An elephant hurt itself when I tried to get out of the zoo yesterday.

21. I don't need any help. I can take care of myself.

22. Sarah and I didn't enjoy ourselves at the disco last night.

23. This exercise isn't very difficult. Do it yourself.

24. My brother can repair the bicycle himself.

6 tháng 11 2016

1, I am having my car serviced by the garage on Monday.

2, He is believed to be mad.

3, No matter how hard I tried, I just couldn't get the money.

2 tháng 11 2016

.

Đặt câu hỏi ... HELP1.  The students have known that famous teacher for 10 years.How long_____________________________________ 2.    I haven't seen my uncle since last summer.When3.   The jeans culture has become associated with youth. What______________ _.__________________________4.   It has taken jeans years to become high fashion clothing.How long______________ _.__________________________5.  Writers and musicians have mentioned the "ao dai" in poems, novels...
Đọc tiếp

Đặt câu hỏi ... HELP

1.  The students have known that famous teacher for 10 years.
How long_____________________________________

2.    I haven't seen my uncle since last summer.
When

3.   The jeans culture has become associated with youth.

What______________ _.__________________________

4.   It has taken jeans years to become high fashion clothing.

How long______________ _.__________________________

5.  Writers and musicians have mentioned the "ao dai" in poems, novels and
songs.

What_______________ _._________________________________

6.            My mother has worn "ao dai" since she began her career as a teacher.
What_________________________________________________

7.            She borrowed some of my English books.

Whose_________________________________________________

8.   Lan has just bought a pair of sandals made in China.

What kind_____________________________ ._______________

).   His rudeness made his friends angry.

9.   His rudeness made his friends angry. What

10.   Phong is very kind and friendly. What

11.  I want the red pen over there.
Which___ _:■'

12.              She didn't come to the party because she got a bad cold.
Why                                                                                                     

13.              Thu can get there in only 10 minutes.

How ' -. .                            ____________________________

14.   Hoa used to write letters to her parents every week last year.

How__________________ _________________________

15.   Thirty students will attend this English course.
How______

16.   You can find some colored pencils in that drawer.
Where____

17.   She usually travels to Hanoi by plane.

How________________________

18.                 It's about 320 kilometers from HCM City to Nha Trang.
How___________ :_________________________________________________________

19. Ms Loan has taught in this school for five years.

How________________________________________________

20.    This coat costs 100.000 dong.

How____________________ .___________ —------------------

21.   They are talking about their summer vacation.
What
__________________ —-—'-—~

22.                The students should talk to their teacher about their project.
Whom__________________________________________

23.That car is my teacher's.

Whose_________________________________________

24.   Ba likes to eat bean soup.

What kind________________________________________

25.   The Pikes are going to visit Thailand and Vietnam.
What____________________ .__________________

26.   Her house is a three-story, white brick house in that corner.
What_________________ ._____ ------------ -------------------- L

27.   Ba and Phong came to the meeting last night.
Who_____________________

What

28.   It takes 5 hours to get to Hong Kong by plane.

How ._______________________________________________

29.  She has been sick for three days.

How  '_____________________ —--—------------------------

3O.   Lien was late for school because the traffic was heavy.

why                               

6
31 tháng 7 2016

1.  The students have known that famous teacher for 10 years.
How long____have the students known that famous teacher ?_________________________________

2.    I haven't seen my uncle since last summer.
When have you seen your uncle ?

3.   The jeans culture has become associated with youth.

What___has culture become associated with youth ?___________ _.__________________________

4.   It has taken jeans years to become high fashion clothing.

How long__has it taken to becom high fashion cloting ?____________ _.__________________________

5.  Writers and musicians have mentioned the "ao dai" in poems, novels and
songs.

What___have writers and musicians mentioned in poems , novels and songs ?____________ _._________________________________

31 tháng 7 2016

6.            My mother has worn "ao dai" since she began her career as a teacher.
What_____has your mother worn since she began her career as sa teacher ?____________________________________________

7.            She borrowed some of my English books.

Whose______has borrowed some of my English books ?___________________________________________

8.   Lan has just bought a pair of sandals made in China.

What kind____of sandals has Lan bought made in China ?_________________________ ._______________

9.   His rudeness made his friends angry. What made his friends angry?

10.   Phong is very kind and friendly. What is Phong's character ?

18 tháng 1 2019
Vì sao phải nghiên cứu thiên văn học
?
Ngày đêm lần lượt trôi đi
,
bốn mùa thay nhau không nghỉ
,
con người sinh sống
trong thế giới tự nhiên luôn tiếp xúc với các hiện tượng
thiên văn
.
Mặt trời rực
rỡ
,
Mặt trăng sáng ngời
,
các vì sao nhấp nháy
,
hiện tượng nhật thực tuyệt đẹp
,
v
.
v
...
hàng ngày đặt ra cho con người muôn vàn câu hỏi
:
Trái đất chúng ta đang
sống là gì
?
Trái đất có vị trí như thế
nào trong vũ trụ
?
Mặt trời chiếu sáng vạn vật
có cấu tạo như thế nào
?
Có bao giờ tắt không
?
Bầu trời trong xanh phía trên
đầu chúng ta gồm những gì
?
Phía ngoài bầu trời còn có những gì nữa
?
Các vì
sao nhấp nháy trên mà
n trời đêm là những vật thể gì
?
Ngoài trái đất mà chúng ta
đang sống
,
trên các hành tinh khác có tồn tại sự sống không
?
Liệu chúng ta có
dịp gặp gỡ trò chuyện với người ngoài trái đất không
?
Những câu hỏi đó đòi hỏi
co
n người phải bỏ ra nhiều công sức tìm tòi nghiên cứu và giải đáp
.
Quá trình
hình thành và phát triển của ngành Thiên văn học chính là quá trình con người
từng bước tìm hiểu thế giới tự nhiên thông qua các hoạt động lao đ
ộng sản xuất
.
Thiên văn học là một môn khoa học tự nhiên lâu đời nhất
.
Trong cuốn sách
“Phép biện chứng tự nhiên”
,
En
gels viết
:
“Trước tiên là thiên văn học
...
những
người dân du mục và nông dân làm nông nghiệp rất cần thiên v
ăn học để xác
định thời vụ
.
”Loài người thời xa xưa qua thực tiễn sản xuất dần hình thành môn
thiên văn học để xác định quy luật thay đổi giữa ngày và đêm giữa các mùa
trong một năm và xác định phương hướng Đông
, Tây, Nam,
Bắc
.
ở châu á
Trung quốc là một trong những nước có ngành Thiên văn học phát triển sớm
nhất
.
Trong quá trình sản xuất nông nghiệp
,
chăn nuôi
,
nhân dân lao động thời đại
cổ đã biết lợi dụng các hiện tượng thiên văn để xác đị
nh thời vụ và không để lỡ
thời vụ gieo trồng
.
Trong sách cổ của Trung Quốc có ghi
:
“Chuôi chòm sao Bắc
Đẩu chỉ về phía đông tức là mùa xuân
,
chuôi chòm sao Bắc Đẩu chỉ về phía nam
tức mùa hạ
,
chuôi chòm sao Bắc Đẩu chỉ về
phía tây tức là mùa thu
,
chuôi chòm
sao Bắc Đẩu chỉ về phía bắc tức là mùa đông”
.
Ngư dân và các nhà hàng hải
xưa kia đã biết quan sát các chòm sao trên trời để xác định phương hướng
,
quan sát Mặt trăng để nắm bắt thuỷ
triều lên xuống
, ...
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Ngày nay ngành Thiên văn học đã có những bước phát triển mới
.
Ngành
Thiên văn học ngày nay gồm nhiều bộ môn và lập ra nhiều loại lịch khác nhau
.
Những loại lịch này không nhũng phục vụ đời sống hàng ngà
y của con người mà
cũng rất cần thiết cho các công việc trắc địa
,
hàng hải
,
hàng không
,
nghiên cứu
khoa học v
.v...
Thời gi
an là vấn đề thường gặp trong đời sống thường ngày của con người
.
Khoa học cận đại càng đòi hỏi ghi
chép thời gi
an chuẩn xác
.
Các đài thiên văn
đã gánh vác trách nhiệm này
.
Các loại thiên thể đều là những phòng thí nghiệm lí tưởng
,
ở đó có những điều
kiện vật lý quý báu mà trên Trái đất hiện nay không có
.
Ví dụ như
có thể to gấp
mấy chục lần Mặt trời
,
nhiệt độ cao tới mấy tỉ độ
,
áp suất cao tới mấy tỉ at
mot
phe
và mỗi cen
timet khối vật chất của thiên thể đó nặng tới mấy tỉ tấn
.
Qua nghiên
cứu thiên văn
,
con người thường được thiê
n nhiên gợi ý để áp dụng vào thực tế
sản xuất trên Trái đất
.
Giở lại những ghi chép trong lịch sử khoa học
,
chúng ta
dễ dàng nhận thấy
:
qua tổng kết quy luật chuyển động của các hành tinh
,
con
người đã đúc rút được định
luật vạn vật hấp dẫn
;
qua việc nghiên cứu Mặt trăng
quay quanh Trái đất
,
con người đã chế tạo ra vệ tinh nhân tạo
;
Sau khi quan trắc
tia quang phổ của lớp khí he
li
(
He
)
trên Mặt trời
,
con người đã tìm thấy khí he
li
trên trái
đất
;
qua quan trắc năng lượng các vụ nổ trên các vì sao
,
con người đã
phát hiện ra những nguồn năng lượng mới và đang nghiên cứu tìm cách tận
dụng nguồn năng lượng khổng lồ đó cho nhân loại
...
Thiên văn học có quan hệ rất mậ
t thiết với các ngành khoa học khác
.
Trước
thế kỷ
19
,
thiên văn học không tách rời toán học và cơ học
.
Ngày nay khi khoa
học kỹ thuật đã phát triển tới trình độ cao
,
thiên văn học càng liên quan chặt chẽ
với các ngành khoa
học khác
.
Chúng ta đều biết sau khi Ein
stein nêu ra thuyết
tương đối
.
Chính những kết quan trắc thiên văn đã chứng minh hùng hồn
nguyên lý đó của En
stein
.
Phát hiện quan trọng của ngành thiên văn học trong
những năm
60
về quần
thể các vì sao
,
bức xạ sóng vi ba và các phần tử hữu cơ
trong vũ trụ
,
...
đã đặt ra những vấn đề mới cần nghiên cứu và giải đáp cho các
ngành khoa học như vật lý cao phân tử
,
cơ học lượng tử
,
vũ trụ học
,
hoá học và
n
guồn gốc sự sống
.
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Thiên văn học giúp con người khám phá ra bộ mặt thật của thiên nhiên
.
Mấy
nghìn năm qua
,
loài người đã có lúc nhận thức sai lầm về tính chất của Trái đất
,
vị trí của Trái đất trong vũ trụ và cấu tạo
của vũ trụ
.
Nếu như không có ngành
Thiên văn học thì chắc chắn những nhận thức sai lầm đó vẫn còn xảy ra
.
Nhà
thiên văn học Ba Lan Coper
nic đã vứt bỏ những trói buộc hàng nghìn năm của
thế lực tôn giáo phản động
, đưa ra t
huyết Nhật tâm
(
Mặt trời là trung tâm
)
,
giúp
nhân loại tiến một bước khá dài nhận thức về vũ trụ
.
Ngày nay cả các chú bé
học sinh cấp I cũng biết rõ chân lý “Trái đất hình tròn”
.
Thế nhưng ngày nay vẫn còn một số người
lợi dụng việc loài người tạm thời
chưa giải thích được một số hiện tượng thiên nhiên để bán rao thuyết vũ trụ duy
tâm đủ màu sắc
.
Họ tuyên truyền nào là thế giới phi vạn chất
,
vũ trụ có giới hạn
về không gi
an và thời
gi
an
,
con người không thể nhận thức được vũ trụ
.
Vì vậy
có thể thấy
,
ngày nay ngành Thiên văn học vẫn đang có cuộc đấu tranh giữa hai
loại quan niệm vũ trụ và nhận thức luận
.
Trong thời đại con người đã bước lên tàu vũ tr
,
ngành Thiên văn học đang
tập trung tinh hoa trí tuệ của loài người để nghiên cứu nhận thức thiên nhiên
.
Nếu như có ai đó không hiểu biết gì những thành quả vĩ đại của ngành Thiên
văn học hiện đại thì chứng tỏ người đó chư
a được đào tạo trong nhà trường
.
Bởi
vậy nhiều nước trên thế giới đã đưa ra môn thiên văn học vào chương trình giáo
dục trung học
.
Trên đây chúng ta mới chỉ giới thiệu qua về sự phát triển và ứng dụng của
thiên văn học
. Qua
đó có thể thấy thiên văn học có tác dụng thúc đẩy khoa học
h...