Across
- 3. X-1 x-raysource
- 4. orange and white
- 7. the smallest planet.
- 8. is one of the smallest stars ever discovered.
- 9. gas giant made up mostly of hydrogen and helium
- 11. its orange
- 12. the coldest planet in our Solar System
Down
- 1. the brightest object in the sky after the Sun and the Moon.
- 2. suddenly brightened in the 17th century
- 5. The Planet we live on.
- 6. chemically-peculiar variable star
- 7. most distant star, 9 billion light years away.
- 10. a diamond star