Emily Lakdawalla talks about UnmannedSpaceflight.com, a place where everyday people explore the solar system by processing images from robotic spacecraft.

Dr. Amy Mainzer discusses how she and her team calculated how many asteroids are out in space, waiting to be discovered.

Dr. Barbara Cohen discusses craters on our moon, and how they will be explored by a new NASA mission called Lunar Flashlight.

Dr Paddack, one of the discoverers of the YORP effect, tells some funny stories from his time at NASA.

Brent Barbee discusses how he figures out which asteroids astronauts could fly to, and the fun of solving problems using computers.

Dr. Nancy Chabot tells us about the MESSENGER mission, which explored the closest planet to the sun.

Rob Landis talks about operating the Hubble Space Telescope, and the time he had a front-row seat to a dramatic interplanetary collision.

Dr. Kirkpatrick talks about stars so cold you could touch them without getting burned.

Dr. Sarah Noble talks about the LADEE mission and an epiphany she had in graduate school.

Dr. Abby Fraeman talks about Phobos and Deimos, the mysterious moons of Mars.