https://www.live-feeds.com/feed/a-gravitational-battle-within-the-earth-is-changing-the-length-of-daysContinuously updated, source-cited coverage. https://www.live-feeds.com/feed/a-gravitational-battle-within-the-earth-is-changing-the-length-of-dayshttps://www.live-feeds.com/feed/a-gravitational-battle-within-the-earth-is-changing-the-length-of-days#u91906Wed, 30 Sep 2026 23:03:17 +0000Researchers have found that a gravitational battle between Earth's inner core and mantle is altering the planet's rotation, changing the length of days by a few milliseconds over decades. This change is imperceptible but significant for satellite and navigation systems. The study, published in Nature, suggests that the inner core's slightly lopsided shape and its gravitational interaction with the mantle cause these variations.Why it mattersUnderstanding these changes is crucial for maintaining precise timekeeping and navigation systems, which rely on accurate measurements of th