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Random Space Fact

You've heard it on Planetary Radio, you've seen it on Twitter, now watch Random Space Fact on YouTube! 

How many stars are in the known universe? What's the oldest spacecraft still in orbit? How massive is Jupiter? Watch our weekly Random Space Fact series to find answers to these kinds of questions.

Are you an educator? Here are some ideas to help you get started with using RSF videos in your classroom. Can't stream YouTube from the classroom? Download all RSF episodes here (2 GB).

Here is a list of all RSF videos including topics so you can search for topics of interest.

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How to Prevent Asteroids from Hitting Earth

Everything you want to know about preventing an asteroid from hitting the Earth, featuring Dr. Bruce Betts, chief scientist of The Planetary Society.

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What is Planetary Defense?

Planetary Defense is the term that describes how to protect the Earth from asteroid impact. In this video series, we're going to explore a 5 Step Plan to preventing asteroid impact.

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How to Save the World from Asteroids Together

No matter how you look at it, asteroid impact is an international issue that requires international coordination. Watch this video to learn what is required for an international disaster response to an asteroid threatening Earth.

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How to Deflect an Asteroid

If an asteroid is going to impact the Earth, what do we do? In this video, we'll cover the variety of techniques (and various states of readiness) to deflect an asteroid to save the Earth.

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How Do We Find Asteroids?

We don't know how to prevent an asteroid impact if we don't first find the asteroid. Watch this video to learn how we find asteroids.

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How Do We Know If An Asteroid is Going to Hit Earth?

How do we know if an asteroid is going to hit Earth? The answer is tracking! Watch this video to learn how tracking asteroids can save the Earth from an asteroid impact.

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How Do We Characterize Asteroids?

If we need to deflect an asteroid to save the Earth, we have to characterize it. Watch our video to learn why asteroid characterization is critical to saving the Earth from asteroid impact.

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Globular Clusters

Bill Nye stops by for a tasty episode about globular clusters. Part of a balanced galaxy!

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How Big Telescopes Work

Bruce is at Mt. Wilson to explain how big telescopes, like the 100-inch, can look deep into space.

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Hubble's Giant Universe

Bruce is feeling small at Mt. Wilson as he explains how Edwin Hubble helped define our place in space.

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