The history of our understanding of the center of the universe is explored through this film. The ideas of Aristotle, Copernicus, Bruno, Descartes, and Herschel are included, as well as the new discoveries that have helped the theories...

If you think the world revolves around you, think again! In this super-short clip, the narrator explains, accompanied by drawings, how scaling varies based on your frame of reference or vantage point. You might want to add this clip to...

An informative video explains the density of particles immediately after the Big Bang, as well as the concept that whenever a particle was released, it would merge with another particle. Sal develops the concept of being able to receive...

Sal explains the Big Bang and the spatial concepts of infinity versus a 'sphere' of expanding matter in detail.

Sal gives an example of where the Hubble telescope looks, as well as the level of detail that the camera can see.

The concept of the universe can be incredibly complex on both physical and mathematical levels. Yet Salman Khan can explain concepts that lead to conclusions about the universe's size. He uses intriguing diagrams and presents information...

A scaled timeline highlights periods relevant to us since the Big Bang. Events on the timeline include the formation of Earth, the extinction of dinosaurs, and the emergence of modern humans.

A video series where astrophysicist Matt O'Dowd investigates the outer reaches of space. Explores topics from asteroids to gravitation waves to sci-fi!

Learn about what happened in the Universe after the big bang. Also find out about cosmic background radiation, how hydrogen and helium turned into stars, formed galaxies, created heavy elements, and eventually created planets. [14:37]

Learn how dark energy accelerates the expansion of space. Find out about the theory that the universe will expand indefinitely and faster all the time. [11:22]

To understand that our universe is constantly expanding, learn about those first few minutes of the universe's life. [12:35]

Crash Course walks students through the start of everything: The Big Bang. We'll look at how the universe unfolded at its very beginning, and how everything in the universe that we know today came into being. [14:26]

Has the universe a beginning or was it here since forever? Well, evidence suggests that there was indeed a starting point to this universe we are part of right now. But how can this be? How can something come from nothing? And what about...

How is CERN's Large Hadron Collider (LHC) a time machine? View this video introduction to the LHC and its role in helping us understand the universe's origins fifteen billion years ago. [11:00]

This video segment adapted from NOVA explains the origin of the elements and how scientists use unique element profiles to identify supernova types. Includes background reading and discussion questions. [1:55]