Earth's mysterious core may be encased by an ancient ocean floor that has mountains 5 times taller than Everest

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An illustration shows the Earth's core wrapped in red matter representing a newly discovered structure that may be wrapping around the Earth's core.

Videos show mysterious lights in the sky just before a devastating earthquake hit Morocco. Scientists can't figure out why.

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People looks through the rubble following a powerful earthquake in Morocco that killed thousands.
Rubble left behind by a 6.8 magnitude earthquake that hit Friday near Marrakesh, Morocco, and is thought to have killed thousands. Social media posts report seeing flashes of light in the sky shortly before the quake.

Khaled Nasraoui/picture alliance via Getty Images

Balloons detect mysterious sounds in the stratosphere below the human hearing limit. Scientists can't explain.

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view above a cloudy earth with a blue horizon against the blackness of space and the sun glaring in the upper right
A view from 13 miles above Earth, from one of Sandia National Laboratories’ solar-powered hot air balloons.

Courtesy of Guide Star Engineering LLC

Ghostly flying 'whirlpool' that appeared above Hawaii could be leftover SpaceX rocket fuel

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A blue spiral flies through the night sky on January 18. Photo captured by a National Astronomical Observatory of Japan camera.
A blue spiral flies through the night sky on January 18. Photo captured by a National Astronomical Observatory of Japan camera.

National Astronomical Observatory of Japan

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