Dark matter: How does it explain a star's speed? - Don Lincoln
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All the stars in a spiral galaxy rotate around a center -- but to astronomers, the speed that each star travels wasn't making sense. Why didn't stars slow down toward the edges as expected? Don Lincoln explains how a mysterious force called dark matter is (possibly) the answer -- and why the search for an answer matters.
Dark matter appears to be about five times more common than the familiar form of matter that makes up you and me. When dark energy (which is another component of the universe) is taken into consideration, our regular form of matter comprises a mere 5% of energy and matter in the universe. How do you feel about so much of the universe being composed of matter that we have never directly observed?
About Space Ed
Space Ed helps you untangle the mysteries of space with the universe’s best videos on everything from Einstein's theory of relativity to what it would take to live on Mars. Brush up on the science, philosophy and mystery of space, because the fabric of the universe is the same fabric that connects us all.
Meet The Creators
- Narrator Don Lincoln
- Director Gatze Zonneveld
