Big Picture Science – A Sudden Change in Planets

by Gary Niederhoff on September 7, 2014


Big Picture Science – A Sudden Change in Planets
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A planet is a planet is a planet. Unless it’s Pluto – then it’s a dwarf planet. But even then it’s a planet, according to experts. So what was behind the unpopular re-classification of Pluto by astronomers, and were they justified?

As the New Horizons spacecraft closes in on this small body, one planetary scientist says that this dwarf planet could be more typical of planets than Mars, Mercury, and Saturn. And that our solar system has not 8 or even 9 planets, but 900.

Also, meet a type of planet that’s surprisingly commonplace, although we don’t have one in our solar system: super Earths. Could they harbor life?

And the DAWN mission continues its visit to the two most massive residents of the asteroid belt: Vesta and Ceres. Discover what these proto-planets may reveal to us about the early solar system.

Listen to individual segments here:
Part 1: Alan Stern / New Horizons
Part 2: David Stevenson / Super Earths
Part 3: Marc Rayman / DAWN Mission
Part 4: Rebekah Dawson / Migrating Planets
Part 5: David Eicher / Planetary Designations

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