http://www.astronomycast.com/listeners/questions-shows/questions-show-moons-and-the-drake-equation-stars-in-the-void-and-rings-around-stars/

From January 2009.

This week we find out if moons around other planets could support life, if there’s anything out there between galaxies, and whether stars form rings.

- Could there be other moons in the Universe, could they habitable, and how would that affect the Drake Equation?

- Are there lone stars – and planets – in the voids in space?

- Are there stars with rings? (Google HL Tauri)

- What is the "Main Sequence" of stars?

- Is dust a big problem for spacecraft?

- How do we determine the mass of celestial objects?

- Are all planets in the ecliptic?

- How are complicated astronomical computer simulations run?

- Is There Dark Antimatter?

- If you were in a spaceship traveling at the speed of light and you shone a flashlight on the wall, would you see any light on the wall?

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