The star-forming area Messier 17, also known as the Omega Nebula or the Swan Nebula, is a vast region of gas, dust and hot young stars that lies in the heart of the Milky Way in the constellation of Sagittarius. ESO/INAF-VST/OmegaCAM hide caption

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ESO/INAF-VST/OmegaCAM
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Why We're All Trapped In 3-D

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The Brain's GPS May Also Help Us Map Our Memories

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Saturn has a rocky surface, but it's deep beneath the clouds. That makes it hard to tell exactly how long the day is. NASA hide caption

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NASA

A Day's A Day The World Around — But Shorter On Saturn

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Strontium atoms floating in the center of this photo are the heart of the world's most precise clock. The clock is so exact that it can detect tiny shifts in the flow of time itself. Courtesy of the Ye group and Brad Baxley/JILA hide caption

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Courtesy of the Ye group and Brad Baxley/JILA

New Clock May End Time As We Know It

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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

The Cathedral Spires in the Black Hills of South Dakota are just one of innumerable formations across the planet that speak to the Earth's ancient history. K. Scott Jackson/Ohio Water Science Center/USGS hide caption

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K. Scott Jackson/Ohio Water Science Center/USGS
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Is Time Real?

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