Earth had its oxygen stolen from it by a bombardment of asteroids

A new study has connected the bombardment of asteroids onto Earth's surface during its formative years to past oxygen levels.

@JakConnorTT
Published Tue, Nov 2 2021 6:03 AM CDT   |   Updated Mon, Nov 29 2021 6:37 PM CST

The new study published in the journal Nature Geoscience reveals that Earth was pummeled by asteroids and comets more often than previously thought, affecting the development of oxygen in the atmosphere.

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Earth first began forming 4.6 billion years ago, and during its early formative years, it experienced regular asteroid and comet impacts; some asteroids had diameters of more than 6 miles. The study explored the impact these asteroids and comets had on the development of oxygen and found that the impacts delayed the time when oxygen started to accumulate in the atmosphere, and thus the timing of life that uses respiration to produce energy being supported.

When an asteroid or comet collides with Earth, a large vapor plume is created, and some of the vaporized rock within this plume begins to cool and fall back down to the Earth's surface. These ancient pieces of vaporized rock are around the size of sand but contain vital information for researchers. The study analyzed these particles to find out how often Earth was bombarded by a space-rocks and found that Earth was smacked with an impact every 15 million years, which was 10 times the rate of previously estimated models.

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Additionally, the researchers asked how these impacts would have affected the atmosphere of the planet and found that if an impact occurred from an asteroid that was larger than 6 miles wide, an oxygen sink would have been triggered - sucking all of the oxygen out of the atmosphere.

The paper also details that as time went on and the number of collisions reduced, the oxygen levels of the planet began to rise, but it wasn't until 2.4 billion years ago did the impacts slow down enough for an oxygen-rich atmosphere to be produced, and thus, the process of evolving life as we know it.

If you are interested in reading more about this story, check out this link here.

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Jak joined the TweakTown team in 2017 and has since reviewed 100s of new tech products and kept us informed daily on the latest science and space news. Jak's love for science, space, and technology, and, more specifically, PC gaming, began at 10 years old. It was the day his dad showed him how to play Age of Empires on an old Compaq PC. Ever since that day, Jak fell in love with games and the progression of the technology industry in all its forms. Instead of typical FPS, Jak holds a very special spot in his heart for RTS games.

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