Across
- 5. Found between Mars and Jupiter
- 7. the distance at which 1 AU covers an angle of 1 arcsecond
- 9. Cosmic clouds of gas and dust
- 10. The largest known structures that are definitely gravitationally bound
- 11. distance light travels in one year
- 13. energy emitted as electromagnetic radiation per second
- 14. How many major planets are in our solar system?
- 15. average distance between the Sun and Earth
Down
- 1. Emits exceptionally large amounts of energy
- 2. What are asteroids, minor planets and planetoids considered as?
- 3. contains less than seven thousand stars
- 4. composed of dust and ice and settled into irregular orbits
- 6. a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity
- 8. Ancient spherical clusters of stars held together by mutual gravity
- 12. This is where Pluto lies