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.
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.
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.