Из колонки В

C. Составьте словосочетания глаголов из колонки А и существительных

B. Найдите к словам в колонке А антонимы из колонки В.

Braking, small (not serious or important).

Forward, remain in space at one place, spending or using, thrust without losses,

Height, propelling force, wished, be greater than, pressing, what remains, force directed

Solar Sails

If we are going to open the solar system to rapid economic

travel, we need to find advanced space propulsion systems. Solar

sails may be among the keys to future inteфlanetary flights.

Solar sail propulsion uses large, lightweight reflectors attached

to spacecraft that react to the light pressure from solar photons to

obtain thrust. By tilting (наклонять) the sail to change the force

direction, the light pressure can be used to increase the orbital

speed of the spacecraft, sending it outward from the Sun, or decrease

its orbital speed, allowing it to fall inward.

А new type of solar sail, called a solar photon thruster, has a

large sail that always faces the Sun for maximum light collection.

The collector sail has a slight curvature (кривизна) that focuses

the sunlight down onto a much smaller sail, which redirects the

sunlight to provide the net thrust vector desired. Besides being

more efficient than a standard sail, a solar photon thruster can be

launched at Shuttle altitudes. Standard sails can only operate above

1,000 km where the light pressure exceeds the atmospheric drag.

Were a solar sail made light enough, it could «hover» without

orbiting, the light pressure from the solar photons balancing the

gravity attraction of the Sun and/or Earth. Then it would be possible

to use solar sails first for communication, broadcast, and

weather satellites, second for scientific stations hovering over the

Sun and the rest of the solar system, and third for transporting

cargo to and from Earth, the planets, and asteroid belt — without

an expenditure of fuel.

А

1. long

2. forward

3. increase

4. heavy

5. slow

6. invisible

7. changing

8. with

9. simplicity

10. rise

11. presence

12. outward

В

a. absence

b. permanent

с rapid

d. short

e. lightweight

f. complexity

g. rearward

h. inward

i. visible

j. without

k. decrease

1. fall

А

1. launch

2. promote

3. conduct

4. increase/lower

В

a. study, investigation, research, experiment,

test

b. speed, thrust, pressure, cost, drag

с satellite, spacecraft, space station,

rocket

d. cooperation, development, technical

progress

Упражнение 4. Заполните пропуски словами.

aboard life-support key facilities assembly supply maintenance stays

weightless tool

1 systems of the ISS are expected to be the most advanced,

they can... cleaner air, purer water, better food, and more

sanitary toilet... than on the space shuttle. 2. Life... the station

may not be easy, but it is significantly healthier and more pleasant

than in the past, allowing astronauts to focus more on the scientific

research and station... that occupy them for about 9 hours a day.

3. Thanks to the long... on Mir station researchers learned that

bone loss did not lessen over time as previously thought. 4. In the...

environment of space, everyday activities present new challenges.

5. The Mobile Servicing System to be supplied by Canada is a

four-piece robotic... that will play a... role in... and maintenance

of the ISS.

Упражнение 5. A. Назовите 15-20 ключевых слов и словосочетаний на

тему «The International Space Station».

В. Speak about:

Solar sail propulsion systems.

Дата добавления: 2014-12-27