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Dr. Marc Rayman, astrophysicist, mission engineer, and past project manager of Deep Space 1, answers questions about space science and technology.

	Why is Earth's core so hot? + Listen now (MP3) + Read transcript
	How did the Milky Way get its name? + Listen now (MP3) + Read transcript
	Is time travel possible? + Listen now (MP3) + Read transcript
	Where is the center of the universe? + Listen now (MP3) + Read transcript
	Why are stars different sizes? + Listen now (MP3) + Read transcript
	What if the Sun became a black hole? + Listen now (MP3) + Read transcript
	Why does Earth rotate? + Listen now (MP3) + Read transcript
	What powers a comet? + Listen now (MP3) + Read transcript
	Could you fly through a gas giant planet? + Listen now (MP3) + Read transcript
	Why do the planets orbit the Sun? + Listen now (MP3) + Read transcript
	What causes the beautiful Northern Lights? + Listen now (MP3) + Read transcript