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Everyone loves a theme. And this week we've collected together some of your questions about relativity. More light speed spacecraft, twin paradoxes, and the mixing up of gravity, time and mass. If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name. No comments

When you think about the best pictures in astronomy, almost every one is a nebula; the pillars of creation in the Eagle Nebula, or the complex Helix Nebula - or my personal favorite, the Ring Nebula. They're beautiful, wispy clouds of gas and dust that signify both the birth and death of stars. Today we give tribute to nebulae. No comments

Another week, another roundup of your questions. This week listeners asked: what is galactic dust anyway, and where does it come from? Why can photons move at the speed of light? And how can astronomers know what happened right after the Big Bang? And there's even more. If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name. No comments

Hosts: Steve Gibson with Leo Laporte

Our regular mailbag episode with questions and comments from our listeners.

To sign up for a free audio book, visit AudiblePodcast.com/securitynow.

For 16kpbs versions, transcripts, and notes (including fixes), visit Steve's site: grc.com, also the home of the best disk maintenance and recovery utility ever written Spinrite 6.

Security Now is brought to you by Astaro Internet Security.

Bandwidth for Security Now! is provided by AOL Radio.

Running time: 1:28:59

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You know what this show needs? More aliens. Since we don't seem to have any visiting right now, we're going to have to find some. SETI is an acronym. It stands for the Search for Extraterrestrial Intelligence. But there's more to SETI than just putting up a radio telescope and hoping to catch a glimpse of an alien television broadcast. No comments

Hosts: Steve Gibson with Leo Laporte

Steve tells you why you must always explicitly log out from banking and other important sites.

Audible pick: METAtropolis. To sign up for a free audio book, visit AudiblePodcast.com/securitynow.

For 16kpbs versions, transcripts, and notes (including fixes), visit Steve's site: grc.com, also the home of the best disk maintenance and recovery utility ever written Spinrite 6.

Security Now is brought to you by Astaro Internet Security.

Bandwidth for Security Now! is provided by AOL Radio.

Running time: 1:15:26

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Hosts: Steve Gibson with Leo Laporte

Airport security checks and balances, white knuckle Disney adventures, and the limits of spyware infestations…

Audible pick: Dr. Who. To sign up for a free audio book, visit AudiblePodcast.com/securitynow.

For 16kpbs versions, transcripts, and notes (including fixes), visit Steve's site: grc.com, also the home of the best disk maintenance and recovery utility ever written Spinrite 6.

Security Now is brought to you by Astaro Internet Security.

Bandwidth for Security Now! is provided by AOL Radio.

Running time: 1:48:31

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Another week, another roundup of your questions. This week listeners asked: are we all going to die in 2012 when the solar system passes through the galactic plane? Did Venus make the Moon? And what will extraterrestrials see when the Sun is dead and gone? And there's even more. If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. No comments