Podcaster: Fraser Cain & Dr. Pamela Gay

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Title: Ep. Astronomy Cast: Questions Show: The Source of Atmospheres, the Vanishing Moon, and a Glow After Sunset

Organization: Astronomy Cast



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?

Bio: Fraser Cain is the publisher of Universe Today and Dr. Pamela Gay is a Senior Scientist at Planetary Science Institute and a Director of  CosmoQuest. They team up to do Astronomy Cast, a weekly facts-based journey through the cosmos

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– 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?

End of podcast:

365 Days of Astronomy

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