Science

1. A gravitationally bound system consisting of stars, stellar remnants, an interstellar medium of gas and dust, and dark matter.
6. The archer
8. The crab
10. Also called degenerate dwarf
12. A gravitationally bound system consisting of stars, stellar remnants, an interstellar medium of gas and dust, and dark matter.
14. Latin word for bull
15. A prominent constellation located on the celestial equator and visible throughout the world
16. Also known as dog star

2. The water bearer
3. The scorpion
4. A stellar explosion that briefly outshines an entire galaxy, radiating as much energy as the Sun or any ordinary star is expected to emit over its entire life span, before fading from view over several weeks or months
5. A white dwarf that has sufficiently cooled that it no longer emits significant heat or light
7. The fish
9. The galaxy that contains our Solar System
11. An interstellar cloud of dust, hydrogen, helium and other ionized gases.
12. The twins
13. the Lion
16. The boundless three-dimensional extent in which objects and events have relative position and direction