From May 7, 2009.

How do planets get their atmospheres? What would happen to the Earth if the Moon just disappeared? And what’s that strange glow we see after sunset?

 

- What would happen if the Moon disappeared — would that change Earth’s orbit?

- How do planets get atmospheres?

- I see a faint glow after sunset in the East — what could it be?

- Can light get stuck in orbit around a black hole?

- Where on Earth would I weigh the most?

- How much less would I weigh if the moon was directly overhead?

- How is ionized hydrogen detected in space?

- Do we live in an unbalanced Universe?

- Why do some celestial objects form in disks and others don’t?

- Could a spacecraft perform a “solar system assist,” in the way we do gravity assists?

- If Earth had no axial tilt, how eccentric would its orbit have to be to have  seasons like we have now?

- Does light have mass?

- The Cosmic Microwave Background is a redshift of the Big Bang.  If one could travel near light speed, would that counteract the redshift?

- Is repulsive gravity real?

 

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