What is dark matter?

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Dark Energy and Dark Matter, Center for Astrophysics

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What is Dark Matter and Why is it Important?

Dark matter and dark energy explained - Secrets of the Universe

Shining a Light on Dark Matter - NASA Science

What Is Dark Matter?

Does Dark Matter Ever Die?, NOVA

What is Dark Matter? Montreal Science Centre

Is dark matter mostly 'dark atoms'? – Physics World

What is dark matter?. Explore the mystery of dark matter with

Ask Ethan: When Were Dark Matter And Dark Energy Created?