Space shuttle Atlantis has just started a three-minute "de-orbit burn" and is beginning its descent into Earth's atmosphere. It's coming home after NASA's last shuttle mission into space.
The shuttle and its four-member crew are due to land at the Kennedy Space Center in Florida at 5:56 a.m. ET. They've been in space nearly 13 days.
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For a look at NASA's post-shuttle future, see this Morning Edition story from NPR's Nell Greenfieldboyce.