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

<p><strong>From May 7, 2009.</strong></p> <p>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?</p> <p> </p> <p><em>- What would happen if the Moon disappeared — would that change Earth’s orbit?</em></p> <p><em>- How do planets get atmospheres?</em></p> <p><em>- I see a faint glow after sunset in the East — what could it be?</em></p> <p><em>- Can light get stuck in orbit around a black hole?</em></p> <p><em>- Where on Earth would I weigh the most?</em></p> <p><em>- How much less would I weigh if the moon was directly overhead?</em></p> <p><em>- How is ionized hydrogen detected in space?</em></p> <p><em>- Do we live in an unbalanced Universe?</em></p> <p><em>- Why do some celestial objects form in disks and others don’t?</em></p> <p><em>- Could a spacecraft perform a “solar system assist,” in the way we do gravity assists?</em></p> <p><em>- If Earth had no axial tilt, how eccentric would its orbit have to be to have  seasons like we have now?</em></p> <p><em>- Does light have mass?</em></p> <p><em>- The Cosmic Microwave Background is a redshift of the Big Bang.  If one could travel near light speed, would that counteract the redshift?</em></p> <p><em>- Is repulsive gravity real?</em></p> <p> </p> <p>We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.<span class= "Apple-converted-space"> </span></p> <p>Just visit: <a href= "https://www.patreon.com/365DaysOfAstronomy">https://www.patreon.com/365DaysOfAstronomy</a> and donate as much as you can!</p> <p>Share the podcast with your friends and send the Patreon link to them too!<span class="Apple-converted-space"> </span></p> <p>Every bit helps! Thank you!</p> <p>------------------------------------</p> <p>Do go visit <a href= "http://www.redbubble.com/people/CosmoQuestX/shop">http://www.redbubble.com/people/CosmoQuestX/shop</a> for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!</p> <p>