NASA scientists explain space science and technology concepts and answer questions sent to us by our community partners across the nation.
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
What causes the beautiful Northern Lights?+ Listen now (MP3)+ Read transcript
