A one-ton satellite is expected
to crash down to earth this weekend – but scientists don’t know where.
The European Space Agency (ESA) says
the craft, which has been in low-Earth orbit since 2009, has run out
of fuel, ending its mission.
It is expected to disintegrate on
re-entry, with most of the fragments burning up in the atmosphere.
But around 20% of the satellite’s
mass – about 200kg – is expected to crash to earth in various fragments and
it’s impossible to predict where they will land.
However ESA scientists say there is
no need to worry – humans are much more likely to win the lottery than get hit
by the debris.
Dr Heiner Klinkrad, head of the
ESA’s Space Debris Office said: “The risk to the population on ground will be
minute. Statistically speaking, it is 250,000 times more probable to win the
jackpot in the German Lotto than to get hit by a GOCE fragment.
“In 56 years of space flight, no
man-made space objects that have re-entered into Earth’s atmosphere have ever
caused injury to humans.”
The satellite, known as the Gravity
Field and Steady-State Ocean Circulation Explorer (GOCE), has been mapping the
Earth’s gravitational field, which is important for understanding changing sea
levels.
The craft’s orbit is decaying
rapidly. It is expected to reach an altitude of 80km above the earth’s surface
on Sunday night, at which point it will begin to disintegrate.

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