China's Tiangong-1 space
station has been orbiting the planet for about 5 years now, but recently
it was decommissioned and the Chinese astronauts returned to the
surface. In a press conference last week, China announced that the space
station would be falling back to earth at some point in late 2017.
Normally, a
decommissioned satellite or space station would be retired by forcing it
to burn up in the atmosphere. This type of burn is controlled, and most
satellite re-entries are scheduled to burn up over the ocean to avoid
endangering people. However, it seems that China's space agency is not
sure exactly when Tiangong-1 will re-enter the atmosphere, which implies
that the station has been damaged somehow and China is no longer able
to control it.
This is important because it
means Tiangong-1 won't be able to burn up in a controlled manner. All we
know is it will burn up at some point in late 2017, but it is
impossible to predict exactly when or where. This means that there is a
chance debris from the falling spacecraft could strike a populated area.
Fortunately, it's unlikely anyone will be
injured. Most of the parts of the space station will burn up in the
atmosphere, and the few that do make it to the ground probably won't
land in any populated areas. (It's a big planet.) Still, watch the skies
late next year. You never know what could be falling down on you.
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