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Planetary RadioSeptember 6, 2017

Sailing on the Light of the Sun With Lou Friedman

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Special Guests
Jason Davis headshot v.3
Jason Davis

Journalist and Digital Editor, The Planetary Society

Headshot of Louis Friedman
Louis D. Friedman

Co-Founder and Executive Director Emeritus, The Planetary Society

The co-founder and Executive Director Emeritus of the Planetary Society returns for a conversation about the allure of sailing through space. Digital editor Jason Davis reviews three exciting space sail projects, and LightSail Program Manager Bruce Betts provides a LightSail 2 update before giving us his regular What’s Up report. There are two space trivia contests to close out before we offer a new opportunity to win the weekly prize package.

LightSail 1 with solar sails deployed

The Planetary Society

LightSail 1 with solar sails deployed
LightSail 1 captured this image of its deployed solar sails in Earth orbit on June 8, 2015.
Heliogyro solar sail concept

NASA / JPL

Heliogyro solar sail concept
The heliogyro solar sail had 12 spinning blades that were each four miles long. Here, the spacecraft approaches Halley’s Comet.
NEA Scout

NASA

NEA Scout

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Trivia Contest

This week's prizes are the brand new Chop Shop-designed Planetary Radio t-shirt, a 200-point iTelescope.net astronomy account, and a Great American Eclipse commemorative shot glass.

iTelescope.net
iTelescope.net

This week's question:

How long is the longest dimension of the Cassini spacecraft, not counting the booms—the main spacecraft’s structure before deployment?

To submit your answer:

Complete the contest entry form at http://planetary.org/radiocontest or write to us at planetaryradio@planetary.org no later than Wednesday, September 13th at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

To within a minute, what is the longest possible time of totality for a solar eclipse seen from Earth?

Answer:

The longest possible time of totality (in the current era) for a solar eclipse seen from Earth is about 7.5 minutes.

Question from the week before:

What is the funny word used when three celestial bodies are lined up, as in an eclipse? It’s not “stooges.”

Answer:

Syzygy is the funny word that describes the alignment of three or more celestial bodies.

Listen more: Planetary Society Projects, Planetary Radio, solar sailing, LightSail

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