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Early planetary systems are thought to be full of havoc as infant bodies collide and fuse to form larger planets. In fact, in our own solar system, the Earth and moon are thought to be the product of this type of giant collision. While these impacts are considered common, astronomers have had difficulty seeing them around other stars so far.
Astronomers at MIT, the National University of Ireland Galway, Cambridge University, and elsewhere have spotted evidence of a giant impact that occurred in a nearby star system. The star, called hd 172555, is approximately 23 million years old, and is only 95 light-years away from the earth.
An atmosphere stripping impact
“The impact of atmospheric pickling" Everyone is interested in watching a huge impact because we expect it to be common. Everyone is interested in watching a huge impact because we expect it to be common.
We do not have evidence in a lot of systems. We now have a better picture of this dynamic." The crew determined that it was likely 200 000 years ago, at a speed of approximately 22 000 mph (10 kilometres per second).
The team determined that the collision probably took place at least 200,000 years ago, at a speed of approximately 22,000 miles per hour (10 kilometres per second).
The impact was between a planet as big as the Earth and a smaller impactor. They also estimated that the high-velocity impact probably carried away part of the planet's atmosphere, astronomers have looked at the data collected by alma, the great millimeter network of atacama in Chile, This includes 66 radio telescopes, whose spacing can be adjusted in order to increase or decrease their image resolution.
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