Space Crossword

2. The unit used to measure force.
3. The force of attraction between two objects.
4. One of gravity's factors.
7. The unit used to measure mass
9. ______________ was one of the first astronomers that suggested the Sun was at the center of the solar system.
12. A huge collection of stars.
13. Electromagnetic spectrum is a family of waves including light,________,microwaves and radio waves.
14. The ___________ is a collection of 8 planets and the sun along with bodies in the forms of asteroids meteoroids and comets.
15. An _______ is a space probe that goes into orbit around a planet or a moon.
16. All the galaxies and the space between them.
18. The shape of a planet's orbit around the Sun.
19. A space probe that lands on a planet or moon.
20. The path a moon or satellite takes around a planet.

1. Heat energy that travels by radiation, it's able to travel through transparent things and a vacuum.
5. A man made satellite.
6. Anything that orbits a planet or moon.
8. On Earth, gravity pulls on every kilogram of mass with a ______ of 10 N
10. An unmanned that has cameras and other equipment to collect data on other planets.
11. The force of gravity can get be increased if the two objects have large masses.
17. A huge ball of gas that releases heat and energy.