Across
- 5. A large group of smaller galaxy clusters or galaxy groups
- 7. The outer asteroid belt of the solar system is known as the ______ belt
- 9. Cosmic clouds of gas and dust
- 10. The distance at which one astronomical unit subtends an angle of one arcsecond
- 12. Considered the smallest structure in the universe, being roughly 1.2×10^-10 m in radius
- 14. The most common/abundant atom in the universe
- 16. Which planet has a diameter 11 times the diameter of Earth?
- 17. The Number of planets in the Solar System
Down
- 1. An astronomical object of very high luminosity found in the centres of some galaxies and powered by gas spiraling at high velocity into an extremely large black hole
- 2. Milky Way is falls under this classification of galaxy types
- 3. Energy emitted as electromagnetic radiation persecond
- 4. Second most common/abundant atom in the universe
- 6. The fastest speed in the universe is the speed of _____
- 8. Pluto is classified as a _____ planet
- 11. The Earth’s radius is about 3.666 times larger than the ____
- 13. Cloud which marks the border of the Solar System
- 15. Which planet has a radius of 6,378 km?