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What is UTC?
By Adam Mann last updated
Reference Here's how time is coordinated around the world.
The rotation of Earth's inner core is slowing down
By Samantha Mathewson published
The rotation of Earth's inner core began to slow down more than a decade ago, altering the length of our days by fractions of a second.
Space photo of the week: 'Earthrise,' the Christmas Eve image that changed the world
By Jamie Carter published
Snapped from lunar orbit in 1968 by NASA astronaut Bill Anders, who died this week at age 90, 'Earthrise' is perhaps the most iconic image of our planet ever taken.
4,000-year-old 'Seahenge' in UK was built to 'extend summer,' archaeologist suggests
By Tom Metcalfe published
The construction of the monument and another beside it more than 4,000 years ago corresponds to a time of bitter cold.
June solstice 2024 brings changing seasons to Earth on June 20 — What to know
By Joe Rao published
Summer will officially arrive in the Northern Hemisphere on Thursday (June 20) at 4:51 p.m. EDT (2051 GMT) — the June Solstice. Here's what you need to know.
Billion-dollar disasters have been sweeping across the US this year
By Meredith Garofalo published
There have been nearly a dozen billion-dollar disasters so far this year, with two powerful severe weather events adding to the list in May.
Alaska's rivers are turning bright orange and as acidic as vinegar as toxic metal escapes from melting permafrost
By Harry Baker published
Alaska's melting permafrost is dumping toxic metals into the state's rivers, turning them bright orange and making the water highly acidic. The contaminated rivers are so vibrant they can be seen from space, and the problem is likely to get much worse in the future.
An interstellar cloud may have caused an ice age on Earth. Here's how
By Robert Lea published
The sun protects our solar system's planets from the harsh environment of interstellar space; 2 million years ago, a dense cloud of matter could have curtailed this shielding.
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