Across
- 2. What the M in M87 stands for
- 4. Sharing the name of an element
- 8. What the "c" represents in the popular "E=mc^2" (3w)
- 11. NASA plans to explore deeper into this planet
- 13. "It's not ______ science"
- 16. Where boys go and lose intelligence
- 17. Known but wasn't imaged until 2019
- 18. Big name in space exploration, abbr.
- 19. Galaxy closest to ours
Down
- 1. Like most star systems; containing two stars
- 3. Popular cat in a box
- 5. Space movie starring Sandra Bullock
- 6. Name of a fictional dog
- 7. Its abundance of CO2 attracted this fictional microbe
- 9. Hypothesis regarding this object has not been proven (2w)
- 10. Space dog
- 12. In the title of a popular Bowie song
- 14. Dog star
- 15. The Sun
- 17. Popular theory and TV show (2w)
- 20. Popular caramel-chocolate candy bar