A. VOCABULARY

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.

UNIT 12: LIFE ON OTHER PLANETS

adventure (n)
crew (n)
terrorist (n)
alien (n)
fiction film (n)
captain (n)
space buggy (n)
weightless  (a)
galaxy (n)
solar system (n)
UFO (n)
Mercury (n)
Venus (n)
Mars (n)
Jupiter (n)
Saturn (n)
Neptune (n)
Uranus
waterless  (a)
resourceful (a)
airless  (a)
mix-up (n.phr)
checkout (n.phr)
grassy (n)
daytime (n)
breathable  (a)
hydrated  (a)
trace (n)
poisonous  (a)
accommodate (v)
reddish (a)
sense of smell (n.phr)
charge a battery (n.phr)
inhabitant (n)
imagine (v)
flying saucer (n)
land (v)
incident (n)

/ədˈventʃə(r)/
/kruː/
/terərist/
/ˈeɪliən/
/ˈfɪkʃn fɪlm/
/ˈkæptɪn/
/speɪs ˈbʌɡ.i/
/ˈweɪtləs/
/ˈɡæləksi/
/ˈsəʊlər sɪstəm/
/ˌjuː ef ˈəʊ/
/ˈmɜːkjəri/
/ˈviːnəs/
/mɑːz/
/ˈdʒuːpɪtə(r)/
/ˈsætɜːn/
/ˈneptjuːn/

/ˈjʊərənəs/
/ˈwɔːtələs/
/rɪˈsɔːsfl/
/ˈeələs/
/ˈmɪksʌp/
/ˈtʃekaʊt/
/ˈɡrɑːsi/
/ˈdeɪtaɪm/
/ˈbriːðəbl/
/ˈhaɪdreɪtɪd/
/treɪs/
/ˈpɔɪzənəs/
/əˈkɒmədeɪt/
/ˈredɪʃ/
/sɛns/ /ɒv/ /smɛl/
/ʧɑːʤ/ /ə/ /ˈbætəri/
/ɪnˈhæbɪtənt/
/ɪˈmædʒɪn/
/ˈflaɪɪŋ/ /ˈsɔːsə/
/lænd/
/ˈɪnsɪdənt/

cuộc phiêu lưu
(đội) thủy thủ trên tàu, phi hành đoàn
người khủng bố
người ngoài hành tinh
phim viễn tưởng
thuyền trưởng
toa không gian
không trọng lực
thiên hà
hệ mặt trời
vật thể bay không xác định
sao Thuỷ
sao Kim
Sao Hỏa
sao Mộc
sao Thổ
sao Hải Vương
sao Thiên Vương
khô hạn, hạn hán
rất nhiều tài nguyên
không có không khí
nhầm lẫn
thủ tục thanh toán
có cỏ, đầy cỏ
ban ngày
có thể thở được
đầy đủ nước
dấu vết
nhiễm độc
thích nghi
hơi đỏ
khứu giác
sạc pin
cư dân
tưởng tượng
đĩa bay
đặt chân
sự cố

39.
40.
41.
42.
43.
44.

danger (n)
NASA (n)
outer space (n)
planet (n)
surface (n)
trek (n, v)

B. GRAMMAR

/ˈdeɪndʒə/
/ˈnæsə/
/ˈaʊtə speɪs/
/ˈplænɪt/
/ˈsɜːfɪs/
/trek/

hiểm họa, mối đe dọa
cơ quan Hàng không và Vũ trụ Mỹ
ngoài vũ trụ
hành tinh
bề mặt
hành trình, du hành

ĐỘNG TỪ KHUYẾT THIẾU: may & might

I. Cấu trúc
1. Câu khẳng định: S + may/ might + V_inf
2. Câu phủ định: S + may not/ might not + V_inf
3. Câu nghi vấn: May/ Might + S + V_inf?
II. Cách dùng và phân biệt MAY & MIGHT
1. Dùng MAY & MIGHT để diễn tả khả năng xảy ra
Cả hai từ đều nói về khả năng của một sự việc, nhưng chúng ta dùng might khi khả năng xảy ra
thấp, còn dùng may khi khả năng xảy ra cao hơn.
Ví dụ:
I may go to Saigon tomorrow.
She is very busy, but I hope she might join us tomorrow.
Chú ý: Chỉ dùng MIGHT trong câu hỏi để chỉ khả năng
Đặt câu hỏi: không nên dùng may để hỏi về một sự kiện có khả năng xảy ra, mà nên dùng might.
Không nên nói: May you go shopping tonight? 
2. Dùng MAY & MIGHT để xin phép
Cả may và might đều có thể dùng để xin phép, nhưng might thì nhún nhường và lịch sự hơn.
Ví dụ:
May I open the door?
I wonder if I might have a little more wine. 
3. Dùng MAY để chúc tụng
- may có thể dùng để chúc tụng hay nói về hi vọng
Ví dụ:
May you both be very happy. 
May God be with you. 
- may cũng có thể dùng thay thế cho although, despite, even if.
Thay vì nói: Even if he is clever, he hasn't got much common sense.
Có thể nói: He may be clever, but he hasn't got much common sense.
4. Dùng MAY để diễn tả sự cho phép làm gì một cách trang trọng
Ví dụ: You may borrow books in the library.
5. Dùng MIGHT để báo cáo hay tường thuật gián tiếp đã được cho phép sử dụng cái gì đó
trong quá khứ. Khi đó might là dạng quá khứ của may
The professor said to us: “You may use the lab.”
=> The professor told us that we might use the lab.
C. EXERCISES

I. Complete the sentences with the words or phrases in the box.
galaxy

planet

flying saucer

solar system

astronaut

outer space

space buggy

weightless

aliens

traces

1. A___________ is sometimes referred to as an Unidentified Flying Object (UFO).
2. An___________ is a person who is trained for travelling in a spacecraft.
3. Researchers made the amazing findings of___________of water on Mars.
4. A___________ is a vehicle used for driving on the moon.
5. Our___________ is made up of the sun and all the objects that travel around it.
6. Earth is the only known to be habitable to___________ life.
7. Do you believe___________ exist on other planets?
8. Spacecraft are vehicles used for travel in___________.
9. Our___________, the Milky Way, consists of 100 - 400 billion stars.
10. Astronauts on the orbiting space station are___________ because they do not experience a force
of gravity.
II. Choose the best answers to complete the sentences.
1. ___________ is the name of a planet that matches the Roman God of the sea.
A. Mars
B. Sun
C. Venus
D. Neptune
2. Discovered in the Kuiper belt beyond Neptune, ___________ is a dwarf planet.
A. Jupiter
B. Pluto
C. Saturn
D. Mercury
3. Unidentified Flying Objects or “___________” haven't been formally recognized.
A. UFOs
B. spaceships
C. space shuttles
D. spacecraft
4. Some people believe the___________ was created by a big explosion.
A. galaxy
B. atmosphere
C. universe
D. outer space
5. ___________ is named after the Roman God of war.
A. Uranus
B. Jupiter
C. Mars
D. Venus
6. A (n) ___________is a scientist who studies the stars and planets.
A. captain
B. alien
C. astronaut
D. astronomer
7. Astronauts___________ around in space because there is no gravity in space.
A. fly
B. float
C. walk
D. trace
8. In a weightless environment, everything floats___________.
A. uncontrollably B. downwards
C. smoothly
D. constantly
9. On June 2, 1966, Surveyor 1 becomes the first U.S.___________ to land on the moon.
A. flying saucer B. airplane
C. spacecraft
D. helicopter
10. Mars is the most___________ planet in our Solar System besides Earth.
A. powerful
B. notable
C. appropriate
D. habitable
III. Fill in each blank with an appropriate preposition.
1. The children were excited___________ Star Wars: The Last Jedi.
2. Yuri Gagarin was the first person to fly___________ space.
3. NASA scientists are looking___________ habitable planets.
4. Mercury is the closest planet___________ the Sun.
5. He saw aliens coming___________ of the UFO.
6. Venus is very similar___________ Earth in terms of size and surface gravity.
7. Mars is named___________ the Roman God of war.
8. If intelligent aliens exist, how could we communicate___________ them?

9. Humans will be living___________ Mars far sooner than most people think.
10. Neil Armstrong took the first steps on the moon's surface___________ July 20, 1969.
IV. Supply the correct form of the words in brackets.
1. John Young, NASA most___________ astronaut, flown into space six times. (experience)
2. The high concentration of carbon dioxide in the atmosphere makes it___________ to humans.
(poison)
3. The planet Mars has been___________ remotely by spacecraft. (exploration)
4. Saturn's moon Rhea may have a___________ atmosphere that is very similar to Earth's.
(breathe)
5. The term UFO stands for “___________ flying object”. (identify)
6. What___________ could you propose for humans to live in a City on the moon? (accommodate)
V. Complete the sentences using may (not) or might (not). Where two answers are possible,
write them both.
1. Aliens___________ exist in ways that we can't even imagine.
2. Many scientists think that there___________ be life on other planets.
3. Scientists said that farthest stars in Milky Way___________ be cut by another galaxy.
4. I___________ go to the party because I'm not feeling very well.
5. In the future, it___________ be possible to build a spaceship that can travel to distant
planet.
6. I have an appointment at the dentist's at 4.00. ___________I leave half an hour early?
7. Astronomers thought the dwarf planet 2007 OR10___________ have a moon.
8. If we found water on Mars, we___________ use it to make rocket fuel.
9. The examiner says we___________ leave when we've finished.
10. Some scientists think aliens___________ have two legs, or any legs at all.
VI. Complete the reported YES/ NO questions.
1. 'May I ask you a few questions?'
The woman asked John_______________________________________________
2. 'Have you done your project about space exploration?'
The teacher asked me________________________________________________
3. 'Will we be able to live on Mars in 2050?'
Debbie asked her father_______________________________________________
4. 'Are you having a barbecue tonight?'
I asked the Browns___________________________________________________
5. 'Do you like sci-fi films that feature extraterrestrial life?'
Jane asked Tom_____________________________________________________
6. 'Did scientists find life on Mars many years ago?'
Val asked me_______________________________________________________
7. 'Are aliens or UFOs real?'
Many people wondered_______________________________________________
8. 'Can we go to the National Museum tomorrow?'
Sally asked her best friend_____________________________________________
9. 'Do you know NASA has found two new planets?'
Duc asked Trang_____________________________________________________
10. 'Were you here yesterday?'
She wanted to know__________________________________________________

VII. Complete the reported WH- questions.
1. 'Where will we live in 20 years' time?'
Jane asked me_______________________________________________________
2. 'How was your trip to Toronto?'
I asked Peter_________________________________________________________
3. 'Why didn't Judy wait for fireballs last night?'
Sue asked___________________________________________________________
4. 'How many planets are there in the solar System?'
The teacher asked us__________________________________________________ _
5. 'How many days does it take to get to Mars from Earth?'
Elliot wanted to know_________________________________________________ _
6. 'What are you staring at?'
I asked Sally_________________________________________________________
7. 'Who discovered the planet Neptune?'
Joe asked his teacher__________________________________________________
8. 'How long have you been living on the International Space Station?'
He asked the astronaut_________________________________________________
9. 'When will humans go to Venus?'
The students wanted to know____________________________________________
10. 'Where are you going this summer holidays?'
I asked Sally and Andy_________________________________________________
VIII. Rewrite each sentence as reported speech with tense and time and place expression
changes.
1. 'I was here three months ago,' Tim said.
_____________________________________________________________________
2. 'When does the next train leave?' He wanted to know.
_____________________________________________________________________
3. 'Are you meeting Judy at four o'clock today?' She asked me.
_____________________________________________________________________
4. I've already seen this exhibition,' Jane told me.
_____________________________________________________________________
5. 'Who did you meet at the party last night?' My mother asked.
_____________________________________________________________________
6. 'We are having dinner now, so I can only talk for a minute,' Miki said.
_____________________________________________________________________
7. 'May I use your phone?' I asked Peter.
_____________________________________________________________________
8. 'Public spending will be increased next year/ the Prime Minister announced.
_____________________________________________________________________
9. 'My father drinks a cup of coffee every morning before going to work.' Peter said.
_____________________________________________________________________
10. 'How long have you lived here?' Cheryl asked the old woman.
_____________________________________________________________________
IX. Choose the correct answers.

1. 'There was an accident outside the supermarket.'
A. He said there had been an accident outside the supermarket.
B. He said there was an accident outside the supermarket.
C. He said there has been an accident outside the supermarket.
2. 'Have you ever seen a UFO?'
A. Jim wanted to know if had I ever seen a UFO.
B. Jim asked if I had ever seen a UFO.
C. Jim asked whether I ever saw a UFO.
3. She asked if you'd seen her painting on display in the exhibit.
A. 'Will you see my painting on display in the exhibit?'
B. 'Did you see my painting on display in the exhibit?'
C. 'Have you seen her painting on display in the exhibit?'
4. I'm flying to India tomorrow.'
A. Yesterday, Matt said that he was flying to India tomorrow.
B. Yesterday, Matt told me that I was flying to India the next day.
C. Yesterday, Matt said that he was flying to India the following day.
5. 'Why did you go out last night?'
A. She asked me why I had gone out the night before.
B. She asked me why did I go out the previous night.
C. She wanted to know why I went out that night.
6. My instructor said that we were the best class he'd ever taught.
A. 'You are the best class I've ever taught,' my instructor said.
B. 'You were the best class I ever taught/ my instructor said to me.
C. 'They are the best class he's ever taught,' said my instructor.
7. 'Can you help me with my homework?'
A. Nick asked whether his sister can help him with his homework.
B. Nick asked his sister could she help him with his homework.
C. Nick asked his sister if she could help him with his homework.
8. Bill wanted to know when Susan was going out with Tony.
A. 'When you are going out with Tony, Susan?'
B. 'When was you going out with Tony, Susan?'
C. 'When are you going out with Tony, Susan?'
9. 'I will come if I can finish work early.'
A. He said that he will come if he can finish work early.
B. He told that he would come if he could finish work early.
C. He told me that he would come if he could finish work early.
10. 'What is the closest planet to Earth?'
A. The student wondered if the closest planet to Earth is.
B. The student asked what the closest planet to Earth was.
C. The student asked what was the closest planet to Earth.
X. Complete the passage with the words from the box.
surface survive
frozen
universe
explore
missions
down
might
As we explore the (1) ___________, we naturally ask, “Is there life on other planets?”

In 1976, NASA's twin Viking landers touched (2) ___________ on Mars in an attempt to answer a
weighty question: Is there life on the Red Planet? Since then, NASA and other space agencies have
sent many more (3) ___________ to Mars. However; the answer so far is, “We don't know, but
we'll keep searching.” All life on Earth needs liquid water to (4) ___________. Since spacecraft
haven't found any liquid water on Mars' (5) ___________,
scientists think that there is no life there. But what about below the surface? Spacecraft have
discovered (6) ___________ water in Mars' polar ice caps and in clouds of ice crystals. This
means that there (7) ___________ be liquid water below the surface where it's warmer.
NASA plans to continue to (8) ___________ Mars every two years. In future missions, we'll
explore below the surface and search for liquid water - and life!
XI. Read the passage, then decide if the statements are true (T) or false (F).
THE INNER PLANETS
Planets are large bodies that rotate around the sun. The inner planets, or terrestrial planets,
are the four planets closest to the Sun: Mercury, Venus, Earth, and Mars. Even though these planets
are all small and rocky, they have more differences than they have things in common.
Because Mercury is the closest to the sun, the side that faces the sun gets as hot as 427°
Celsius. At the same time, the side that faces away from the sun is a freezing -173° Celsius. The
extreme temperatures alone make it a very unlikely place for life. With an atmosphere too thin for
human breathing, it's obvious that people won't be living on Mercury any time soon.
The next planet from the sun is Venus. Below clouds of sulfuric gas lies 96% carbon dioxide
atmosphere. That might be nice for a plant, since a plant “breathes” carbon dioxide, but not for a
person. If you managed to survive the atmosphere, the surface of the planet is hot enough to melt
solid metal. Venus has a temperature that is maintained at 462° Celsius, no matter where you go on
the planet.
You are probably most familiar with Earth because it is your home planet. It has the perfect
conditions for life. Earth's atmosphere and oceans help control the trickiest part of making a planet
life-friendly: temperature. Earth is the only planet known to have liquid water.
Mars is the fourth farthest from the sun. Some people think it may be possible for life to exist
there. Although scientists have not been able to find actual water on Mars, there seems to be
evidence of water erosion on its surface. Its canyons and mountains are very similar to those found
on Earth. The main difference is that there is no plant life. Some scientists believe that Mars may
have been very much like Earth until something happened that made the water supply evaporate.
1. The inner planets are located closest to the sun.
2. Mercury is the hottest planet because it's the closest to the sun.
3. Venus has an atmosphere whose composition is similar to that of Earth.
4. The temperature on the surface of Venus is hot enough to melt lead.
5. Earth has a surface temperature that is uniquely friendly to life.
6. Scientists have proved that life once existed on Mars.
7. It seems that Mars once had liquid water on its surface.
8. Some scientists believe that Mars is very similar to the Earth.
XII. Write the second sentence so that it has the same meaning as the first one.
1. American scientists have drawn plans for an extension to the ISS.
Plans_____________________________________________________________
2. “Can NASA prove that there is life on a moon of Jupiter?”
He asked__________________________________________________________
3. The student wanted to know how long it took to get to red planet.
The student asked, “_________________________________________________”
4. Paul left the office before Sarah arrived there.

When Sarah________________________________________________________
5. The heavy snow made it impossible for the plane to take off on time.
The plane was prevented______________________________________________
6. “What time did you get home last night?”
My parents asked____________________________________________________
7. It's possible that Lucy isn't at home now.
Lucy might_________________________________________________________
8. NASA stopped sending humans to the moon in 1972.
NASA hasn't________________________________________________________
9. “We are meeting Tony at 8 o'clock tonight.”
She said that _________________________________________________________
10. Sam told me that he was very tired then because he had been working hard for 12 hours.
Sam said to me, “_____________________________________________________
TEST FOR UNIT 12
I. Choose the word that has underlined part pronounced differently from the rest.
1. A. accommodate
B. adventure
C. alien
D. appropriate
2. A. UFO
B. Jupiter
C. Neptune
D. Future
3. A. saucer
B. crew
C. Mercury
D. accommodate
4. A. climate
B. sighting
C. might
D. aliens
5. A. breathe
B. earth
C. sea
D. meaningful
II. Choose the word whose main stress pattern is placed differently.
1. A. surface
B. UFO
C. alien
D. weightless
2. A. temperature
B. Jupiter
C. Mercury
D. adventure
3. A. atmosphere
B. powerful
C. condition
D. astronaut
4. A. appropriate
B. aeronautic
C. astronomy
D. inhabitant
5. A. similarly
B. discovery
C. accommodate
D. unsuitable
III. Choose the best answer A, B, C or D to complete the sentence.
1. Mercury is the smallest and closest planet___________ the Sun.
A. from
B. to
C. toward
D. of
2. There's no water on Mars even though scientists have found traces__________ it.
A. on
B. with
C. for
D. of
3. Neptune is so far from Earth, it is___________ to the naked eye.
A. invisible
B. impossible
C. disable
D. unsuitable
4. Nick saw aliens corning out of the UFO, which___________ a big disc.
A. stood for
B. consisted of
C. looked like
D. lived on
5. Could we modify Mars'___________ to make it more suitable for human life?
A. climate
B. trace
C. experience
D. trek
6. When do you think the first human___________ walk on the surface of Mars?
A. must
B. should
C. would
D. might
7. Have you ever wondered___________ it would be like to live on the moon?
A. whether
B. what
C. why
D. that
8. Tim asked his teacher when the first space shuttle___________.
A. has been launched
B. will be launched C. had been launched
D. was being launched
9. She wanted to know if I had met Judy at the station___________.
A. the day after
B. the next day
C. the following day
D. the previous day
10. “I saw a UFO hovering above my back garden.” - “___________”
A. You said it!
B. Very funny!
C. You're joking!
D. Absolutely right!

IV. Write the correct tense or form of the verbs in brackets.
1. In 1947 pilot Kenneth Arnold___________ (spot) nine shiny, unidentified flying objects flying
past Mount Rainier.
2. What___________ (happen) if aliens made contact with Earth?
3. He wanted to know how NASA___________ (communicate) with spacecraft.
4. Almost the same as Earth, a day on Mars___________ (have) 24 hours, 39 minutes and 35
seconds.
5. Nick said that he___________ (see) a UFO land in a grassy area the day before.
6. Captain Ray Bowyer gained clear views of two UFOs when he___________ (fly) in the English
Channel.
7. So far, only two spacecraft___________ (fly) to Mercury to collect data.
8. Sue asked her teacher how long it___________ (take) to travel to Mars.
9. Neptune___________ (discover) on September 23, 1846.
10. NASA hope they___________ (be) able to send people to Mars by 2030.
V. Read the passage carefully, then do the tasks.
How many planets are there in our galaxy? That's a tricky question to answer. Are there
other planets that support life? That's exactly what the Kepler mission hopes to discover.
NASA launched the Kepler space telescope, designed to find habitable planets, in 2009. So
far it has discovered five new Earth -sized planets beyond our solar System. These planets are hotter
than the Earth - much too hot for life as we know it. The Kepler team predict that they will need at
least three years to find an Earth-like planet.
The simplest requirement for a planet to have life is for there to be liquid water so the
distance from the planet's sun and therefore temperature are important. There also needs to be the
correct amount of air. If a planet is as small as Mars (half the size of Earth) its weak gravity means
that it can't hold on to air molecules. If a planet is Neptune sized (four times bigger than Earth) it
has very strong gravity and too much air. So size matters too.
The cost of the mission is approximately six hundred million dollars. It is scheduled to
observe until 2013 but this could be extended. Will we be sad if we discover we are alone in our
galaxy or happy if we find that we share it with other life forms?
A. True (T) or False (F).
1. Helper has found five new Earth-like planets.
2. These planets are not in our solar system.
3. A very small planet will have too much air.
B. Choose the best answer.
4. What is the Helper space telescope looking for?
A. planets in our solar system
B. life on other planets
C. new galaxies
D. objects in space
5. A planet can support life if it has .
A. carbon and oxygen
B. gas and water
C. heat and gravity
D. water and air
6. How long will the Helper team need to find an Earth-like planet?
A. three years
B. about three years
C. more than three years
D. less than three years
VI. Read the text and choose the correct answer.
Do you want to plan for some kind of exciting trip? Do you have a million dollars? Are you very
healthy? Are you a good traveler? Do you want to go nowhere? Then you can have a trip to space.
If you decide to take the trip, you will have to get ready a few months before the flight. You must be
in excellent physical condition. You should run a lot, swim every day, do aerobics and push-ups.
You must get a letter from the doctor that shows you are in perfect health.

Once you get on the trip, you will be in different world. You will see pictures of the Earth. You may
also find your country and other interesting places. You will be able to see the oceans, the big rivers,
the tall mountains. You will be able to see them many times because you will orbit the Earth 16
times a day! You will also be able to see stars that you couldn't see from the Earth.
When you are in orbit, you will be able to get out of your seat and walk in the cabin. You will be
able to walk on the walls or on the ceiling like a circus. You will not weigh anything! You will feel
totally free and enjoy the wonderful feeling you have never had before. If you were on board now,
you would experience those marvelous things.
So do you think you will be able to take a space trip? Start to dream now and your dream may come
true someday.
1. What will you be able to see when you get on the trip?
A. the oceans, the big rivers, and the tall mountains.
B. the gardens, the streams, and the tall mountains.
C. the big lakes, the big rivers, and the huge waterfalls.
D. the oceans, the gardens, and the huge waterfalls.
2. How long will you have to get ready before the flight?
A. a few days.   

B. a few months.

C. a few years.     

D. one month.

3. When you are in orbit, you won't be able to.
A. walk on the ceiling

B. walk on the wall.

C. stand up and walk in the cabin

D. sit down and walk in the cabin

4. How many times per day will you orbit the Earth?
A. 16 times            

B. 15 times            C. 14 times          

D. 35 times

VII. Change the following sentences into indirect speech or vice versa.
1. Candy asked me if I had ever read an astronomy book.
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2. 'I'll let you know if I have any more problems,” Carol told her father.
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3. The professor told us that the Moon was more than 380,000 km from the Earth.
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4. “When did the Kepler mission end?” Mark wanted to know.
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5. Daniel asked me if I was going to see lunar eclipse the following day.
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6. The customers said that they had been waiting for more than two hours.
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7. “Can you help me with this tricky math question?” Tim asked his sister.
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8. “NASA is sending a helicopter to Mars next year NASA's administrator said.
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9. They wondered where on Mars humans might first land.
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10. Gwen asked if the spaceship Voyager had flown past Pluto three weeks before.
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