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Planetary RadioFebruary 9, 2016

Planet 9 From Outer Space!

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On This Episode
Mike Brown head shot
Mike Brown

Planetary Astronomer, California Institute of Technology

Konstantin Batygin head shot
Konstantin Batygin

Assistant Professor of Planetary Science, California Institute of Technology

Mike Brown and Konstantin Batygin fully expect a new and undemotable ninth planet will be found in the outer reaches of the solar system. The Caltech researchers talk about their findings and much more. Emily Lakdawalla has made a wealth of Chinese lunar lander images much more accessible. Have gravity waves been discovered? Bill Nye hopes so, as he also remembers Apollo 14 moonwalker Edgar Mitchell.

Planet 9

Caltech / R. Hurt (IPAC)

Planet 9
Artistic rendering of Planet 9 with the distant Sun in the background.
Mike Brown and Konstantin Batygin

Mat Kaplan

Mike Brown and Konstantin Batygin
Planet 9 theorists Mike Brown and Konstantin Batygin study the data in Mike’s Caltech office.

Related Links:

Trivia Contest

This week's prizes are a lovely Planetary Radio t-shirt, a 200-point astronomy account AND a set of Year In Space wall and desk calendars.

This week's question:

What was famous astronomer Herschel’s first and middle names?

To submit your answer:

Complete the contest entry form at or write to us at no later than Tuesday, February 16th at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

In Earth days, how long is a Pluto day (as well as a Charon day)?


The answer will be revealed next week.

Question from the week before:

Where in the solar system is Anthony Patera?


Anthony Patera is both a shallow depression on Venus that honors Susan B. Anthony and a distinguished professor at MIT.

Listen more: obituary, Planetary Society Projects, astronomy, LightSail, the Moon, Chang'E program, Bill Nye

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