Astronomy Crossword

3. A black hole with energetic jets beaming out from two sides
6. When planets move backwards
8. The amount of light a celestial object emits
9. A type of variable star that is very bright and not very common
11. Types of planets that are huge gas balls, including, Jupiter, Saturn, Uranus and Neptune
12. Organisms that are able to live in extreme environments
14. A spinning neutron star that periodically flashes radiation towards earth
15. The outer layer of the sun
18. The largest Galilean moon
19. A distance the wave requires to complete one oscillation

1. A small rocky object that orbits the sun
2. Type of stars that have a hot dense core which fuses hydrogen into helium to produce energy (2 words)
4. A type of galaxy that forms stars
5. A mixture of gases that surrounds a planet
7. A group of stars that form a pattern
10. A giant cloud of dust and gas in space
13. An instrument used for examining spectra especially in the visible region of electromagnetic spectrum
16. A small, mobile robot that is sent to moons and planets to land and explore their surfaces
17. When the wavelength of the light is stretched so the light is seen as shifted towards the red part of the spectrum