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Venus is made of the same stuff of Earth, but is bone-dry, hot enough to
melt lead and has a chokingly thick atmosphere. It even spins backwards.
Astronomers have spent decades trying to explain Venus' mysterious
properties. Now one scientist thinks the planet's formation may explain
all: Two huge, protoplanetary bodies collided head-on and merged to form
our planetary neighbor, but obliterated nearly all water in the process.
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