Space stuff

1. 2 invisible light from the sun
6. 3 bouncing light in telescopes
9. 12 the main sequence of stars, when they are in a ________ equilibrium
11. 16 extremely bright and distant object powered by a supermassive black hole
12. 17 A paradox thought up by a german astronomer that proves the universe isn't infinite
14. 0 the second moon phase
16. 15 a telescope and a classification of galaxies
17. 18 the most important aspect for habitable planets
19. 13 the supermassive eruption of stars.

2. 9 The solar constant is how much energy is received from the sun.
3. 8 a celestial body that orbits a star, but does not achieve dynamical dominance
4. 5 the layer of earth atmosphere from 80-800 km
5. 7 a set of two space probes, the second visiting Neptune and Uranus
7. 14 the type of Galaxy that the Milky way is
8. 4 the second layer of an asteroid
10. 11 radio wavelength used to study interstellar clouds, often said as 21 centimeter _________
13. 6 A planet made up of mostly silicate, rocks, and metals
15. 1 creator of the laws of motion and a measure of force
18. 10 a scale used to measure a star's brightness, using an inverse scale of one to six