Exploring The Universe Crash Course

In which John Green, Hank Green, and Emily Graslie teach you about what happened in the

Thanks to the wonders of physics, astronomers can map a timeline of the

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In which John Green, Hank Green, and Emily Graslie teach you about, well, everything. Big History is the history of everything.

"How do we know that dark matter is there?" In this episode, Dr. Katie Mack and John Green unpack the full story of dark matter.

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Watch experts talk about everything from the big bang to the

From the moon's violent origins to how to build a planet, we take a deep dive into our solar system and the planets within it.

In today's

From extreme orbits and neutron star collisions to supernovas and the most violent events ever observed,

Finally, after what seems like eons and eons, the end is nigh. We're talking not only about the end of

In this episode, Katie Mack and John Green discuss why life was able to happen. Head to https://policygenius.com/

Which planet is the most controversial? Why is Pluto not considered a planet by some? See more in this 3 hour marathon from ...

Welcome to the first episode of

Here it is, folks: the end. In our final episode of

So... how big is the

Thanks to observations of galaxy redshifts, we can tell that the