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Is there a way to approximate, even very roughly, how much of Mars would have to be ejected into space for a Martian rock to land on Earth?
There is a lot to suggest that Mars was in fact once like Earth! However, billions of years ago when the Red Planet was young, it appears to have had a thick atmosphere that was warm enough to support oceans of liquid water – a critical ingredient for life. More information. This was Mars, circa maybe 4 billion years ago. Or at least, it's one vision of Mars painted by Nina Lanza, a researcher at Los Alamos National Laboratory in New Mexico. In a study published this week in the journal Geophysical Research Letters, she and her colleagues argue that the discovery of manganese oxide (which forms in wet, oxygen-rich conditions) on the Martian surface suggests that the planet was once much more Earth-like. Mars Circa 3–4 Billion B.C. (Possible)
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Atmosphere These new findings are extremely exciting for a number of reasons, not the least of which being the opportunity they present to determine the origins of the atmosphere on Mars. The atmosphere would have been a mixture of mostly hydrogen and water vapor, in addition to some trace elements such as nickel, iron, cobalt, silicon, sulfur and copper, as well as some carbon dioxide. This image provided by NASA shows Earth during a recent solar storm. It's a fairly common view that the early atmosphere on Mars consisted of mostly hydrogen and helium, but scientists would rather not take that route, so they are trying to work out what conditions might have existed 4 billion years ago. The Martian atmosphere could have consisted of a mixture of carbon dioxide and water In a perfect world, this would make it so that every grain of Earth's atmosphere.