Mars Once had Enough Water for a Planet-Wide Ocean 300 Meters Deep universetoday storybywill
Scientists theorize that comets and asteroids distributed water and organic molecules to the rocky planets during the Late Heavy Bombardment period. Credit: NASA/JPL-Caltech
These impacts are believed to be how water and the building blocks for life were distributed throughout the Solar System. However, the role of this period in the evolution of rocky planets in the inner Solar System – particularly where the distribution of volatile elements like water is concerned – is still debated. For the sake of their study, the international team reported on the variability of a single chromium isotope in Martian meteorites dated to this early period.
In other words, the composition of these meteorites represents Mars’ original crust before asteroids deposited water and various elements on the surface. Since Mars does not have active plate tectonics like Earth, the surface is not subject to constant convection and recycling. Therefore, meteorites ejected from Mars billions of years ago offer a unique insight into what Mars was like shortly after the planets of the solar system formed.
In addition to water, asteroids also distributed organic molecules like amino acids to Mars during the Late Heavy Bombardment. As Bizarro explained, this means that life could have existed on Mars when Earth was sterile: “This happened within Mars’s first 100 million years. After this period, something catastrophic happened for potential life on Earth. It is believed that there was a gigantic collision between the Earth and another Mars-sized planet. It was an energetic collision that formed the Earth-Moon system and, at the same time, wiped out all potential life on Earth.”that used the deuterium-to-hydrogen ratios of Martian meteorites to create models of atmospheric evolution.
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NASA's Perseverance rover opens a window to Mars' watery pastBriley Lewis (she/her) is a freelance science writer and Ph.D. Candidate/NSF Fellow at the University of California, Los Angeles studying Astronomy & Astrophysics. Follow her on Twitter briles_34 or visit her website www.briley-lewis.com.
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