Join Donate

Planetary RadioApril 22, 2014

A Second Earth, and OSIRIS REx is Go for Asteroid Bennu

Download MP3

On This Episode
Dante Lauretta (updated) head shot
Dante Lauretta

OSIRIS-REx Principal Investigator, University of Arizona

Elisa Quintana head shot
Elisa Quintana

Kepler Mission Research Scientist, SETI Institute

Finally found: an Earth-sized planet in the habitable zone. You’ll hear lead scientist Elisa Quintana make the announcement. Then OSIRIS REx mission Principal Investigator Dante Lauretta will tell us how the spacecraft will return a sample of material from the birth of the solar system. Bill Nye previews the USA Science and Engineering Festival, and Bruce Betts invites everyone to send their names to Bennu on OSIRIS REx.

Kepler-186f: A Second Earth

NASA / Ames / JPL-Caltech / T. Pyl

Kepler-186f: A Second Earth
The artist’s concept depicts Kepler-186f, the first validated Earth-size planet orbiting a distant star in the habitable zone—a range of distances from a star where liquid water might pool on the surface of an orbiting planet. Kepler-186f resides in the Kepler-186 system about 500 light-years from Earth in the constellation Cygnus. The discovery of Kepler-186f confirms that Earth-size planets exist in the habitable zone of other stars and signals a significant step closer to finding a world similar to Earth.

Related Links:

Trivia Contest

This week's prize is the new and improved Planetary Radio t-shirt.

This week's question:

What is the name of the moon orbiting the trans-Neptunian object Quaoar?

To submit your answer:

Complete the contest entry form at or write to us at no later than Tuesday, April 29, at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

What was the dwarf planet Eris named after?


The answer will be revealed next week.

Question from the week before:

Who was the tallest astronaut to fly in space, and how tall was he or she?


At 6’ 4”, Jim Whetherbee was the tallest astronaut launched into space.

Listen more: Planetary Society Projects, Kepler, podcasts and videos, asteroids, events and announcements, OSIRIS-REx, Planetary Radio, extrasolar planets, Bill Nye

You are here:
Comments & Sharing
Bill Nye and people
Let's Change the World

Become a member of The Planetary Society and together we will create the future of space exploration.

Join Today

Mat Kaplan
Support Planetary Radio

Keep our weekly radio program broadcasting online and on the air around the world.