Ezra S. Astronomy

1. The brightest star in the night sky.
3. A group of stars in the night sky that make up a certain pattern.
7. A star that we can currently see supernova-ing.
9. How bright a star appears in the night sky.
11. Every 4 years there is a ____.
13. The brightness of a star.
15. The galaxy we are in.
17. The event that should have been called "the everywhere stretch".
20. 13 constellations that move along the ecliptic.
21. Similar to longitude on Earth, but uses hours to measure along the celestial equator.

2. Bottom half of Earth.
4. A flat map of the celestial sphere.
5. A star that is visble above the horizon year-round.
6. An ancient monument that was used to keep track of the solar and lunar cycles.
8. The distance light travels in one year.
10. How bright a star actually is at a distance of 10 parsecs from Earth.
12. A famous German theoretical physicist.
14. Also known as the northern star.
16. A constellation with the stars Betelgeuse and Rigel in it.
18. A huge collection of gas, dust, and stars in space.
19. The study of the zodiac constellations.
22. The idea that the Earth revolves around the sun.
23. The top half of Earth.