Astronomy

5. Planet outside our solar system, orbiting a star.
7. Vast cloud of gas and dust in space, often the birthplace of stars.
9. Small celestial body that enters Earth's atmosphere, creating a streak of light.
12. Celestial object made of ice, dust, and gas, with a glowing tail when near the Sun.
14. Average distance from the Earth to the Sun.
17. Celestial body primarily composed of hydrogen and helium, emitting light and heat.
19. Vast system of stars, gas, and dust held together by gravity.
20. Sun and the celestial objects that orbit it, including planets, moons, and comets.

1. Celestial body orbiting a star, including Earth.
2. Study of the origin, evolution, and eventual fate of the universe.
3. Explosion of a star, resulting in a burst of light and energy.
4. Region of space with extremely strong gravitational forces, from which nothing can escape.
6. Relating to the sun.
8. Person trained to travel and work in space.
10. Celestial event in which one celestial body obscures another.
11. Rocky or metallic celestial body that orbits the Sun, often found in the asteroid belt.
13. Group of stars forming a recognizable pattern in the night sky.
15. Relating to the moon.
16. Optical instrument used to observe distant celestial objects.
18. Path followed by an object around another celestial body due to gravity.