Across
- 2. any one of the objects in space that are made of burning gas and that look like points of light in the night sky
- 4. a straight line from one side of something (such as a circle) to the other side that passes through the center point
- 5. all of space and everything in it including stars, planets, galaxies, etc.
- 8. The NASA Hubble Space Telescope is a project of international cooperation between NASA and ESA.
- 10. any one of thousands of small planets that circle around the sun.
- 11. the galaxy that includes our Solar System
- 13. an invisible area in outer space with gravity so strong that light cannot get out of it — often used figuratively
- 14. an object in outer space that develops a long, bright tail when it passes near the sun
- 15. unit of distance equal to the distance that light travels in one year (about 5.88 trillion miles or 9.46 trillion kilometers)
- 16. a huge explosion that might have happened when the universe began
Down
- 1. the curved path that something (such as a moon or satellite) follows as it goes around something else (such as a planet)
- 2. our sun and the planets that move around it
- 3. the natural force that tends to cause physical things to move towards each other : the force that causes things to fall towards the Earth
- 6. any one of the very large groups of stars that make up the universe
- 7. A group of stars that forms a particular shape in the sky and has been given a name
- 9. a large, round object in space (such as the Earth) that travels around a star
- 12. the smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule
