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

OSIRIS-REx kicked off its countdown by unveiling our new mission logo

Air Date: 04/22/2014
Run Time: 28:50

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  • Dante Lauretta, OSIRIS-REx Principal Investigator, University of Arizona
  • Elisa Quintana, Kepler Mission Research Scientist, SETI Institute

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

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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.

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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?

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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.


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