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Dan Huot: Welcome to Space To Ground, your
weekly look at what's happening on board the

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International Space Station.

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I'm Dan Huot.

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A Russian spacewalk kicked off the station's
work week and was the second trip outside

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for two Russian flight engineers.

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Cosmonauts Alexander Skvortsov and Oleg Artemyev
worked quickly in the vacuum of space, getting

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all their tasks done in just five hours and
eleven minutes.

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The pair swapped out a number of experiments
that live outside the station, some of which

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are looking at how different materials hold
up when exposed to the harsh environment of

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space.

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They also deployed a small Peruvian satellite
called Chasqui-1 which will orbit the Earth

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and take images of the ground below.

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Also taking flight this week from the ISS
was Planet Labs' latest flock of satellites

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known as Dove sats.

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This fleet of 28 small satellites deployed
from the Japanese module's airlock.

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While in orbit, they'll capture frequent high
resolution images of the Earth's surface that

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are made available to everyone through planet-labs.com.

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The pictures can be used for everything from
monitoring deforestation and the ice caps

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to helping with disaster relief.

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And always ready to share their own views
from the station, the Expedition 40 crew caught

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some fantastic images of the Cygnus spacecraft's
fiery re-entry.

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Crew members Alexander Gerst and Max Suraev
captured these images on Sunday while the

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unmanned cargo craft was breaking up in the
earth's atmosphere, marking a successful end

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to orbital sciences' second resupply mission.

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This week's twitter question comes from Marianna
who asks: "Do all crew members do a spacewalk

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in the six months they're on ISS?"

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As much as they'd all like to, not every crew
member gets to go on a spacewalk.

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However they all get training in NASA's neutral
buoyancy laboratory before flying, just in

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case they get the call to head outside to
perform any major repairs.

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And there certainly hasn't been a lack of
spacewalks in the station's history.

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In the almost 14 years since humans arrived
onboard, they have racked up over 1,100 hours

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across 181 spacewalks to build and maintain
the ISS.