The Universe

2. A celestial body moving in an elliptical orbit around a star.
4. The curved path of a celestial object or spacecraft around a star, planet, or moon.
7. The force that attracts a body toward the center of the Earth, or toward any other physical body having mass.
9. A unit of astronomical distance equivalent to the distance that light travels in one year.
10. A massive, extremely remote celestial object emitting large amounts of energy, typically found at the centers of distant galaxies.
12. An object, either natural or man-made, that orbits a planet or star.
15. The scientific study of celestial objects, space, and the physical universe as a whole.
16. A rapidly rotating neutron star, which emits beams of electromagnetic radiation.
17. A region of space having a gravitational field so intense that no matter or radiation can escape.
18. The universe seen as a well-ordered whole.
19. The smallest planet in our solar system and the closest to the Sun.

1. The space telescope launched in 1990 that has provided revolutionary images of the universe.
3. A cloud of gas and dust in outer space, often the site of new star formation.
5. A small, rocky body orbiting the sun, especially found in the region between Mars and Jupiter.
6. A group of stars forming a recognizable pattern that is traditionally named after a mythological figure or animal.
8. An optical instrument designed to make distant objects appear nearer.
11. All existing matter, space, and time regarded collectively.
12. A stellar explosion that briefly outshines an entire galaxy, radiating as much energy as the Sun is expected to emit over its entire life.
13. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
14. A celestial body consisting of a nucleus of ice and dust, and often a tail of gas and dust.