The cosmic even horizon of the universe is closer to us than the particle horizon. Space Time's Cosmology playlist tackles this and other complex concepts about the universe. The video discusses how the scientists define the edge of the...

As part of their Cosmology series Space Time presents a video that explains the history of electromagnetic waves and the shifting and expanding wavelengths. It finishes by exploring cosmic microwave background radiation. 

Does reality exist, or are we just a part of a larger virtual reality game someone is playing? A mind-bending video explains why we study cosmic history. It presents details about the start of the universe and more accurate predictions...

Physics can help explain mysteries of the universe. Spark your classes' interest with the final lesson in the Crash Course physics series. The instructor explains the basics of astrophysics and cosmology with topics such as Hubble's Law...

What's driving the expansion of the universe, and will it ever stop? Take a trip to the dark side in a video full of surprising facts and twists about our view of what lies beyond. Junior cosmologists learn about the invisible energy of...

Send your space scientists out with a bang! An out-of-this-world video teaches young astronomers about the origin of the universe. The narrator describes the birth of The Big Bang Theory and the physicists and star gazers that...

We have all heard about the Big Bang and other theories about how the universe began, but how will it end? Cosmologists study dark matter and dark energy to try to figure out the answer to this mind-blowing question. This topic is a...

A many-faceted investigation into Albert Einstein. Includes, a Timeline, Light Stuff, Genius among Geniuses, Time Traveler, Relativity and the Cosmos, and much more. Also, Einstein Links and a Teacher's Guide are provided.

The majority of the universe is made up of a currently mysterious entity that pervades space: dark energy. We don't know exactly what it is, but we do know that dark energy accelerates the expansion of space. We think this means the...

Find out how particle physics and cosmology fit together in this scientific discussion.

Enjoy this short biographical clip that details the incredible life of English scientist Stephen Hawking. [4:00]

Astronomers have been able to measure where the point of no return is at the edge of a black hole that is 50 million light-years away. Aired Oct. 5, 2012 [12:43 min]

Nobel Prize-winning astrophysicist Adam Riess takes questions on dark energy and the cosmos.

It's time for the end. At least the end of our first series on Physics here at Crash Course. In this video episode of Crash Course Physics, Shini sits down to talk about Astrophysics and Cosmology. By using what we've learned this year,...

The history of the Universe decorates the night sky. Learn how to watch this history by studying cosmic light emissions. [6:22]

Learn how a star becomes a Red Giant. [11:29]

This Khan Academy resource is a video about a Supernova clarification.

Structure of the Earth - crust, mantle, core

This Khan Academy resource is a video that talks about why cepheids pulsate.

This Khan Academy resource is a video about White and Black Dwarfs.

This Khan Academy resource is a video about what a Supernova (Supernovae) is.

This Khan Academy resource is a video about Supermassive Black Holes.

A video preview of Star Stories. Star Stories focuses on the advances in cosmology and astrophysics that have won Nobel Prizes and brought us more understanding of the stars. [1:06]

The Harvard physicist discusses her latest book, Knocking On Heaven's Door.