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Stephen Hawking

HAWKING’S LEGACY  Among Stephen Hawking’s most notable contributions to physics was the discovery that black holes are not really black. 

illustration of early stars

TOTALLY LIT  The first stars in the universe switched on by 180 million years after the Big Bang, radio observations indicate. Ultraviolet light from early, blueish stars (illustrated) interacted with hydrogen gas, causing it to absorb background radiation, and creating a signature scientists have now detected.

Joe Polchinski

Joe Polchinski, who died earlier this month at the age of 63, believed part of doing science was finding out what kinds of things science can predict.

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