


What are star trackers?
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- What are some unanswered questions about celestial motion?
- What is the celestial sphere? How does parallax help us understand celestial motion?
- What are starspots?
- What are galaxy clusters and superclusters? What is the interstellar medium?
- What are the solstices and equinoxes?
- What are the building blocks of life?
- Is the celestial sphere a real object? What is aberration of starlight?
- What is the autumnal equinox? What are equatorial coordinates?
- Are we alone in the universe?
- How is the proper motion of a star measured?
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