Space terms

3. A massive ball of gas that generates prodigious
4. Any prominent star pattern that isn’t a whole constellation, such as the Northern Cross or the Big Dipper.
8. The fraction of the Moon or other body that we
12. A telescope’s main light-gathering lens or
14. Traditionally, something that happens rarely or never. More recently, this has come to mean the second full Moon in a single calendar month.
15. fusion in its hot, dense core. The Sun
16. Greek for “circle of animals.” It’s the set of constellations situated along the ecliptic in the sky, through which the Sun, Moon, and planets move.

1. The time after sunset or before sunrise when the sky is not fully dark. Astronomical twilight ends after sunset (and begins before sunrise) when the Sun is 18° below the horizon.
2. A supermassive black hole gorging on gas at the
3. illuminated by sunlight.
5. The line on the Moon or a planet that divides the bright, sunlit part from the part in shadow. It’s usually the most exciting and detailed region of the Moon to view through a telescope.
6. a star.
7. of a distant galaxy.
9. of energy (including light) from
10. The point in the sky that’s directly overhead.
11. Great clouds of glowing gas
13. Big collection of stars, gas, and dust