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Scientists first described the flooded cave in 2016 but determined its extraordinary extent years later.

Six earthquakes were recorded at Mount Adams in September — the highest number in a single month since records began in 1982.

The sun has unleashed the most powerful solar flare since 2017, just days after it spat out another monster explosion. Both outbursts have launched solar storms that will likely hit Earth this weekend and trigger vibrant aurora displays.

The newfound wreck could help maritime archaeologists better understand how 20th-century warships were designed.

Archaeologists think the coin dates to the first years of the region's rule by the Ottoman Empire.

On Oct. 2, a partial "ring of fire" solar eclipse was visible from the remote island of Rapa Nui, also known as Easter Island, where around 1,000 stone moai statues stand. You can see the whole celestial event play out in this incredible composite image.

The Thule Inuit people and Norse both hunted walrus in the High Arctic in the 13th century, according to a new study.

Images captured by Curiosity's onboard cameras show several large tears in the tire of one of the rover's wheels. However, the damage does not appear to be slowing the roaming robot down.

A new physical model suggests meltwater from thawing permafrost on Russia's Yamal Peninsula can unlock methane sources at depth, triggering explosions that open enormous craters at the surface.

The U.S. Federal Aviation Administration is investigating the uncontrolled reentry of part of a Falcon 9 rocket that delivered passengers to the International Space Station in a capsule that will return stranded astronauts Butch Wilmore and Suni Williams to Earth next year.

This 2015 photo from the International Space Station showcases the deep tidal channels that cut through a line of cays in the Bahamas. Astronauts say it is "one of the most recognizable points on the planet."