Across
- 2. The brightest celestial object.
- 4. Brightest star in the sky.
- 5. Type of gas that can have fusion reaction.
- 6. Bright stars have these type of numbers.
- 9. Who developed magnitude scale?(2words)
- 10. Refers to relative brightness of stars(2words)
Down
- 1. Extended the magnitude scale.
- 3. Star in group 1.
- 7. Planets reflect this from the sun.
- 8. Closest star to our solar system (2words)