Saturday 28 November 2020 09:55 PM
This massive event stripped most of the Earth’s atmosphere at the time, replacing it with carbon dioxide with little nitrogen – very similar to the composition of the atmosphere of Venus today, and similar to Mars, and these results came from a study by Paolo Souci and his team at ETH Zurich in Switzerland, whose paper, published in Science Advances on Wednesday, examined “the ocean of Earth’s magma and its early flower-like atmosphere.”
To understand Earth’s atmosphere early on, the team set out to recreate these conditions by floating a small piece of rock over a gas jet, then melting it down with a 1900 ° C laser. “This molten little marble that floats at 2,000 degrees Celsius,” Susi told New Scientist. It is a kind of miniature Earth in its molten state. “
By using different gases in the plane to suspend a piece of molten rock, the researchers reconfigured varying atmospheric conditions, allowing them to see which of them most closely matched samples from the mantle and the geological record, and the team found that once the atmosphere released from Earth’s magma ocean cooled, it would. “It will resemble the current planet Venus.” This, they say, indicates that the current differences between Earth’s atmosphere and Venus reflect what happened after the two planets formed.
Our planet is large enough that gravity keeps its atmosphere in place, unlike Mars, while Earth’s position in the solar system also makes it cool enough compared to Venus, meaning that, unlike Venus, water remains in liquid form on the Earth’s surface and can absorb carbon dioxide from the atmosphere to prevent global warming – and most importantly, create the conditions needed to support and preserve life.
Source: The Seventh Day