Articles on Physics

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The Mayall 4-meter Telescope at the Kitt Peak National Observatory houses the DESI instrument. KPNO/NOIRLab/NSF/AURA/P. Marenfeld

Dark energy may have once been ‘springier’ than it is today − DESI cosmologists explain what their collaboration’s new measurement says about the universe’s history

Scientists have conflicting theories on why the universe is expanding at an accelerating rate. New measurements from a massive collaboration complicate these ideas.
The Sun’s distance from Earth allows it to be habitable for life. DrPixel/Moment via Getty Images

Evolving intelligent life took billions of years − but it may not have been as unlikely as many scientists predicted

Humans evolved late in Earth history. While this timing inspired the conclusion that humanlike life is a cosmic improbability, a new study pushes back.
Light at the blue end of the rainbow is scattered more efficiently than the other colors. shomos uddin/Moment via Getty Images

Why is the sky blue?

The answer has to do with molecules.

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