SPACE

2. (5) Massive, luminous spheres of plasma held together by gravity, producing light and heat through nuclear fusion
4. (8) A small rocky body orbiting the Sun, mostly found in the asteroid belt between Mars and Jupiter
6. (8) The totality of space, time, matter, and energy; everything that exists
7. (6) A massive system of stars, planets, gas, and dust bound by gravity; e.g., the Milky Way
8. (6) A small object from space that burns up upon entering Earth's atmosphere, creating a streak of light
10. (5) Solid mineral material found on planets, moons, and asteroids in space
11. (6) A region devoid of matter; outer space is a near perfect vacuum
13. Year (10) A unit of distance equal to the distance light travels in one year (about 9.46 trillion km)
14. (8) Basic chemical substances like hydrogen and helium that make up stars and planets
18. Hole (9) A region in space with gravity so strong that nothing, not even light, can escape

1. (6) The orderly, harmonious system of the universe as a whole
3. (9) An object that orbits a planet or star, either natural (like moons) or artificial (man made)
5. (5) The curved path of an object around a star, planet, or moon due to gravity
7. (7) The force that attracts objects toward one another; it keeps planets in orbit around stars
8. (4) A natural satellite that orbits a planet; Earth's moon influences tides and has phases
9. (6) A vehicle propelled by engines that expel exhaust gases at high speed, used for space travel
12. (5) An icy body that releases gas and dust, forming a glowing tail when near the Sun
15. (9) A planet that orbits a star outside our solar system
16. (6) A vast cloud of gas and dust in space, often a birthplace for stars
17. (5) The vast, seemingly infinite expanse beyond Earth's atmosphere where celestial bodies exist