Asteroid Breakup 800 Million Years Ago May Have Triggered Snowball Earth
Updated
Updated · heise online · Jul 16
Asteroid Breakup 800 Million Years Ago May Have Triggered Snowball Earth
3 articles · Updated · heise online · Jul 16
Summary
SwRI-led researchers linked a giant asteroid-belt collision about 800 million years ago to a bombardment of Earth that may have helped drive the planet toward near-global freezing.
Simulations point to a breakup near Jupiter’s 3:1 resonance, where debris was funneled into the inner solar system and continued arriving for roughly 100 to 150 million years.
Lunar craters from that era preserve the clearest evidence, while earlier work suggests Earth may have suffered about 20 similarly large or larger impacts for every one on the Moon.
The timing overlaps with widespread cooling and major biosphere changes before the Cryogenian Snowball Earth interval of 720 million to 635 million years ago, though the team said the link remains plausible rather than proven.
Did a cosmic collision cause 'Snowball Earth,' or was a massive volcanic event on our own planet to blame?
An ancient asteroid storm may have frozen Earth. Could a similar cosmic bombardment happen again?
If a cosmic barrage triggered a global deep freeze, how did the earliest forms of life survive?
Asteroids, Ice Ages, and the 2024 Hypothesis: Unraveling the Triggers of Snowball Earth
Overview
The 2024 Hypothesis offers a new explanation for Earth's ancient Snowball Earth events. Traditionally, scientists believed these global ice ages were caused by a gradual decline in greenhouse gases, leading the planet to freeze. However, a 2024 study introduced the idea that a massive asteroid impact could have rapidly triggered these dramatic glaciations. This research suggests that a Chicxulub-scale impact around 800 million years ago might have caused the Cryogenian Snowball Earth, showing how sudden, catastrophic events can reshape Earth's climate much faster than slow atmospheric changes.