The Yarrabubba impact crater in Western Australia is the oldest in the world.
, researchers led by Timmons Erickson, from NASA Johnson Space Center and Curtin University, Australia, have now found another possible explanation.
In their study, the team worked out what would have happened if the asteroid, estimated to be between three and six miles wide, had hit a landscape covered in ice. Their findings show a huge amount of water vapor, which is a greenhouse gas, would have been ejected into the atmosphere. Where Western Australia sat on the globe 2.229 billion years ago is unknown. Scientists also do not know whether the continent was covered in ice at this time. This is something the researchers hope to determine in future research, as well as finding more impact sites, Erickson said.that identified a 52-million -year lull in magmatic activity globally. The Yarrabubba impact took place during this lull, Cavosie said.
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