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Velocity: It's All Relative

The Concorde was fast and changed how we thought about travel here on Earth. In the future, we may well travel at speeds that change our relationship with time itself. David Parker/Getty Images hide caption

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David Parker/Getty Images

Opinion

13.7: Cosmos And Culture

Velocity: It's All Relative

Life only seems to get faster and faster. Sometimes it's hard to deal with the speed of change. Commentator Adam Frank says to hold on to your hats because we may well end up bending time itself.

Do Black Holes Exist?

This artist's impression shows the surroundings of the supermassive black hole at the heart of the active galaxy NGC 3783 in the southern constellation of Centaurus. M. Kornmesser/ESO hide caption

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M. Kornmesser/ESO

Opinion

13.7: Cosmos And Culture

Do Black Holes Exist?

Stephen Hawking wants to do away with black holes (as we know them) so he can save the two pillars of modern physics: general relativity and quantum mechanics. At stake is our understanding of the nature of space and time, and how matter affects, and is affected by, both.