Space and Space Travel

4. to go in a circle around a central point
6. to start an activity, especially an organized one
7. the force that attracts objects in space towards each other, and that on the earth pulls them towards the centre of the planet, so that things fall to the ground when they are dropped
8. a mass of ice and dust that moves around the sun and looks like a bright star with a tail
11. an electronic device that is sent into space and moves around the earth or another planet. It is used for communicating by radio, television, etc. and for gathering information.
13. a creature from another planet
14. a curved path followed by a planet or an object as it moves around another planet, star, moon, etc.
16. the scientific study of the sun, moon, stars, planets, etc.
17. an area in space that nothing, not even light, can escape from, because gravity (= the force that pulls objects in space towards each other) is so strong there
19. the action of counting numbers backwards to zero, for example before a spacecraft is launched

1. a large hole in the top of a volcano
2. any of the large systems of stars, etc. in outer space
3. an occasion when the moon passes between the earth and the sun so that you cannot see all or part of the sun for a time; an occasion when the earth passes between the moon and the sun so that you cannot see all or part of the moon for a time
5. to burst (= break apart) or make something burst loudly and violently, causing damage
6. the distance that light travels in one year, 9.4607 × 1012 kilometres
9. a space that is completely empty of all substances, including all air or other gas
10. a piece of rock from outer space that makes a bright line across the night sky as it burns up while falling through the earth’s atmosphere
12. the action of one object or surface moving against another
15. any one of the many small planets that go around the sun
18. controlled by people (eg. spacecraft)