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How gravity causes a perfectly spherical ball to roll down an inclined plane is part of elementary school physics canon. But the world is messier than a textbook. Scientists have sought to ...

How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon. But the world is messier than a textbook. Scientists in the Harvard John A.

How gravity causes a perfectly spherical ball to roll down an inclined plane is part of elementary school physics canon. But the world is messier than a textbook. Scientists in the Harvard John A.

NASA's long-lived rover Opportunity has returned an image of the Martian surface that is puzzling researchers. Spherical objects concentrated at an outcrop Opportunity reached last week differ in ...

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Astronomers have discovered an unusually perfect spherical object within the Milky Way, puzzling researchers about its origin and evolution. Named Teleios—the ancient Greek word for “perfection”—this ...

The universe is a chaotic place filled with exploding stars, material falling into black holes, and rogue planets wandering off on their own. All that chaos makes astronomers suspicious when they ...

Video taken aboard a US Navy ship off the coast of San Diego shows a mysterious, spherical object flying in the air before disappearing into the ocean, reports said Friday. The footage is the source ...