Space :thumbup:

1. an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases
3. an object spinning on its own axis
5. the brightness of a celestial object
10. a point in space where gravity is so strong not even light can escape
12. a device created to give evidence to earths orbit
15. a point directly above
16. the concept/theory of the sun being the centre of the universe / solar system
18. every single object and chunk of matter combined
19. a system of millions or billions of stars combined with gas and dust held together with gravity
20. an object obscuring the light to / from another object

1. a collection of stars forming an image
2. One of the two points within an ellipse whose distance apart determines the eccentricity of the ellipse
4. a telescope in space made to discover galaxies outside our own
6. a fixed luminous point in the sky
7. the theory that earth is the centre of the universe / solar system
8. a measure of how high up a certain point / object is
9. a fragment of spatial matter that falls to the surface of a planet.
11. the centre of the solar system
13. the man who made Hubble
14. a small rocky / metallic body in outer space
17. an objects rotation around another object in space