Space Crossword

2. The force of attraction between two objects.
5. The unit used to measure force.
6. The unit used to measure mass
7. An unmanned that has cameras and other equipment to collect data on other planets.
9. Electromagnetic spectrum is a family of waves including light,________,microwaves and radio waves.
10. A huge collection of stars.
11. A space probe that lands on a planet or moon.
12. Anything that orbits a planet or moon.
13. The ___________ is a collection of 8 planets and the sun along with bodies in the forms of asteroids meteoroids and comets.
16. The force of gravity can get be increased if the two objects have large masses.
18. ______________ was one of the first astronomers that suggested the Sun was at the center of the solar system.

1. A man made satellite.
3. Heat energy that travels by radiation, it's able to travel through transparent things and a vacuum.
4. A huge ball of gas that releases heat and energy.
8. On Earth, gravity pulls on every kilogram of mass with a ______ of 10 N
14. The path a moon or satellite takes around a planet.
15. One of gravity's factors.
17. The shape of a planet's orbit around the Sun.
19. All the galaxies and the space between them.
20. An _______ is a space probe that goes into orbit around a planet or a moon.