Across
- 5. A planet outside our solar system that orbits a star other than the Sun.
- 8. Everything that exists, including all of space, time, planets, stars, and galaxies.
- 10. An astronomer who made important discoveries about galaxies, including the fact that the universe is expanding.
- 11. The distance that light travels in one year, which is about 5.88 trillion miles.
- 13. A group of stars that form a pattern in the sky.
- 14. A large cloud of gas and dust in space, often where stars are born or where stars explode and die.
- 15. A large galaxy that is very close to the Milky Way.
Down
- 1. A type of galaxy that has arms that curve outward from the center, like the Milky Way.
- 2. A huge group of stars, planets, gas, and dust, all held together by gravity.
- 3. A massive explosion of a star at the end of its life.
- 4. A spot in space where the gravity is so strong that not even light can escape from it.
- 6. A tool that helps scientists and astronomers see distant objects in space more clearly.
- 7. A type of galaxy that has an oval or round shape, and is made of older stars.
- 9. A type of galaxy that has a scattered or uneven shape.
- 12. A scientist who studies space, stars, planets, galaxies, and other objects in the universe.