science
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Watch as NASA Launches Solar Sail to Test Sunlight-Propelled Space Travel
A new experimental mission by NASA is ready to set sail in orbit, using photons from the Sun to propel its way to higher altitudes. The Advanced Composite Solar Sail System (ACS3) is scheduled for launch on Tuesday during a launch window that opens at 6 p.m. ET. The mission will lift off on board…
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You Need to See These Photos From the U.S. Solar Eclipse
Millions of people experienced totality on Monday as the Moon wandered between Earth and the Sun.
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Astronomers Uncover Micro ‘Galaxy’ Orbiting the Milky Way
The weird, faint star system—the tiniest Milky Way satellite ever found—could be under the influence of dark matter.
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Neutron Stars Spew Jets That Travel at Relativistic Speeds, Scientists Say
These fast-moving outbursts of material are slightly different from those launched by black holes.