Across
- 3. the sun and the group of planets that move around it
- 6. a loose outer piece of clothing without sleeves, that fastens at the neck, and is worn instead of a coat making you impossible to see
- 8. someone who studies the nature and origin of the universe
- 11. a robot (= machine controlled by computer) that is made to look like a human
- 13. knowledge of a future event, especially when this comes from a direct message to the mind, such as in a dream, rather than by reason
- 14. the curved path through which objects in space move around a planet or star
- 16. either of two theories of physics giving the relationship between space, time, and energy, especially for two objects moving in different ways
- 18. a form of energy that can be produced in several ways and that provides power to devices that create light, heat, etc.
Down
- 1. the distance that light travels in one year (about 9.5 million million kilometres)
- 2. an artificial object in space used to send out television and radio signals around the earth's surface
- 4. a cylinder-shaped device for making objects that are far away look closer and larger, using a combination of lenses, or lenses and curved mirrors
- 5. a region in space where gravity is so strong that nothing, not even light, can escape
- 7. a vehicle used for travel in space
- 9. the act of travelling by an imaginary very fast form of transport that uses special technology or special mental powers, or of causing someone or something to travel in this way
- 10. a vehicle designed for air travel that has wings and one or more engines
- 12. a ship that can travel underwater
- 15. the large explosion that many scientists believe created the universe
- 17. the idea of travelling into the past or the future