Planetary Radio • Aug 26, 2014

Alan Stern and a Big Milestone on the Way to Pluto

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On This Episode

Stern A Photo High Res Speaking

Alan Stern

New Horizons Principal Investigator

New Horizons passed through the orbit of Neptune on August 25th. By cosmic coincidence, this was the 25th anniversary of Voyager 2’s flyby of that big, blue world. We catch Principal Investigator Alan Stern right after a celebration in Washington. Alan also talks about the Rosetta comet mission and a new Uwingu initiative. Emily Lakdawalla shares a gorgeous new image of Neptune based on Voyager data. Bill Nye tells us why a major ground test of the LightSail solar sail was cancelled. Waiting for an easy space trivia contest question? This is your week!

New Horizons flies over Pluto
New Horizons flies over Pluto Artist's concept of New Horizons as it reaches Pluto.Image: NASA / Thierry Lombry

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This week's question:

In Earth years, how long is a Pluto year?

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Last week's question:

What were the names of the five pocket mice flown on Apollo 17?


The answer will be revealed next week.

Question from the week before:

What two chemical elements, both discovered in 1803, were named after asteroids?


The two chemical elements discovered in 1803 and named after asteroids are Cerium and Palladium.