Satellites and space

3. A satellite that has not been made by humans
5. Millions of stars grouped together
6. A large object orbiting a star, like the Earth.
9. A satellite used to take pictures of the Earth - for instance to help forecast the weather.
13. All the galaxies and the space between them
14. The family of waves that includes light, infrared, microwaves and radio waves
15. An orbit where a satellite is over the equator and takes exactly 24 hours to circle the Earth, so it always stays over the same part of the Earth.
16. A star with planets and other objects orbiting it
17. A space probe that goes into orbit around a planet or moon.
18. The unit of force
19. A space probe that lands on a planet or moon.

1. A huge ball of gas that gives out heat and light energy
2. A satellite made by humans
4. An unmanned spacecraft that has cameras and other equipment to find out about other planets.
7. The path that a planet takes around a star, or the path that a moon or satellite takes around a planet.
8. A satellite used to transmit TV programmes or telephone calls
10. Anything that orbits a planet or a moon
11. Oval shaped. The shape of a planet's orbit around the Sun.
12. Another name for heat energy that travels by radiation. It can travel through transparent things and a vacuum (empty space)
15. The force of attraction between any two objects