Across
- 6. a large artificial satellite on which people can live and work for long periods of time
- 7. an object that orbits a planet
- 8. any stable star that is fusing hydrogen in its core to form helium (like our SUN)
- 12. a place that is empty of all matter
- 13. the small, dense remains of a high-mass star
- 15. an object whose gravity is so strong that nothing, not even light, can escape
- 16. an optical instrument that forms enlarged images of distant objects
Down
- 1. all of space and everything in it
- 2. the initial explosion that resulted in the formation and expansion of the universe
- 3. the blue-white hot core of a star that is left behind after its outer layers have expanded and drifted out into space
- 4. the brilliant explosion of a dying supergiant star
- 5. a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
- 9. the velocity an object must reach to fly beyond a planet's or moon's gravitational pull
- 10. a device that expels gas in one direction to move in the opposite direction
- 11. a small robotic space probe that can move about the surface of a planet or moon
- 14. a ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion