Tuesday, July 22 will be the second-shortest day of the year, as Earth completes a full rotation in less time than usual. The ...

From 1973 to 2020, the shortest day ever recorded was only 1.05 milliseconds shorter than 24 hours, Space.com reads. Since ...

Earth is spinning faster this summer, making the days marginally shorter and attracting the attention of scientists and ...

Scientists break down the reasons why days are getting shorter—and the mystery they're still trying to solve about Earth's ...

Time will stop on Tuesday, but only for a second. The world's timekeepers will be adding a sliver of time—a leap second—to our clocks. Just as leap years keep our calendars lined up with Earth ...

Scientists are inching one step closer toward redefining the length of a second. To do that, they're using atomic clocks. Atomic clocks, which look like a jumble of lasers and wires, ...

The National Institute of Standards and Technology has set a new world record for the most accurate aluminum ion-based ...

A "leap second" will be added to the world's atomic clocks on June 30, 2015, to accommodate Earth's gradually slowing rotation. (Image credit: NASA) ...

The Second Atomic Bomb The crew of Bockscar dropped the Fat Man bomb over Nagasaki just three days after the first nuclear weapon hit Hiroshima. Tony Reichhardt . August 9, 2013.

A "leap second" will be added to the world's official clocks on Dec. 31 at 23 hours, 59 minutes and 59 seconds Coordinated Universal Time (UTC), which corresponds to 6:59:59 p.m. EST; the clocks ...