Khan Academy: Cosmology and Astronomy
Khan Academy

It’s a great, big universe out there. In this section of Khan Academy, you’ll learn about the brain-bending vastness of time and space.

Ologies: Cosmology (THE UNIVERSE) with Katie Mack

Astrophysicist and cosmologist Katie Mack (@astrokatie) joins to tell us her most embarrassing moments as a cosmologist, to debunk some physicist myths and give the nuts + bolts of everything form particle physics to gravitational waves and existential mysteries.

Short Wave: What Is Dark Energy? Physicists Aren't Even Sure
Short Wave (NPR)

Dark energy makes up almost 70% of our universe and is believed to be the reason the universe is expanding. Yet very, very little is known about it.