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Earth's days once got 2 hours longer — and that may have triggered one of the biggest evolutionary explosions in history, study suggests
By Tia Ghose published
The moon once drifted thousands of miles farther away, and Earth's days got 2.2 hours longer, a new study finds.

Giant exoplanet the size of 2 Jupiters has a hidden companion disturbing its orbit
By Robert Lea published
Using the NASA exoplanet-hunting spacecraft TESS, astronomers have discovered a hot Jupiter dancing with a hidden super-Earth companion.

How do supermassive black holes 'starve' their galaxies to halt star formation?
By Robert Lea published
The "deaths" of galaxies are caused by their central supermassive black holes, and the "smoking gun" evidence of this connection takes an unexpected form.

Some rocky exoplanets could have huge amounts of water in their molten cores
By Keith Cooper published
Young, hot planets could soak up a lot of water into their core, with up to 10 times more water inside than on the surface of the planet.

Have astronomers found the 'secret recipe' for rapid planet growth?
By Robert Lea published
Jupiter, Saturn, Neptune, and Uranus may dominate the solar system, but their formation remains mysterious. A new model could account for these planets' rapid and efficient births.

Satellites capture Hurricane Ernesto racing across the Atlantic (images)
By Sharmila Kuthunur published
NOAA satellites in orbit have recorded real-time views of Hurricane Ernesto as it made landfall in Bermuda before sailing through the Atlantic.

What happens to the wreckage created when extreme dead stars clash?
By Robert Lea published
Neutron stars are the universe's most extreme stars, composed of matter so dense a teaspoon of it would weigh as much as Mt. Everest. So, when they collide, it's quite the event.

Mars rock samples show signs of water in Jezero Crater — could life have once existed there?
By Stefanie Waldek published
NASA's Perseverance rover didn't find organic matter within the rocks, but scientists will keep looking.
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