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houston station on space to ground

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meet nasa's newest record-breaking

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astronaut

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welcome to space to ground i'm dan

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hewitt jeff williams just broke the

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record for most time in space for an

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american

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as of august 24th williams has spent

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over 520 days in space in his lifetime

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surpassing the record set by one-year

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crew member scott kelly just a few

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months ago

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williams's career started on shuttle

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atlantis during sts 101 back in the year

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2000. he then rode on three russian

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soyuz vehicles to the station as a

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long-duration crew member during three

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six-month stints in 2006 2009 and right

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now

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by the time he returns in early

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september he'll have accumulated 534

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days in space setting a high bar for

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future nasa astronauts

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after over a month attached to station

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it's time for spacex's dragon to depart

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the crew closed the hatch to dragon on

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thursday after packing it with about 3

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000 pounds of cargo

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the spacecraft which launched back on

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july 18th delivered almost 5 thousand

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pounds of supplies to the station

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including the first international

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docking adapter which was installed

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during a spacewalk last week

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the only resupply craft capable of

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re-entry dragon is returning a variety

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of science samples and experiments

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including heart cells that were cultured

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aboard the space station to study how

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microgravity changes the human heart

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this week twitter user the tracer wants

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to know where the thrusters are located

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on the iss to find out we need to head

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over to the russian segment of the space

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station

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the russian service module also known as

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zvezda has 32 attitude control engines

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they're split up into two groups of 16

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engines each able to control the

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attitude and altitude of the station the

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primary method for boosting the station

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though is using the russian progress

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resupply vehicle which when docked

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provides another 24 engines eight of

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those can be used for reboost regularly

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raising the station's altitude or firing

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to avoid space junk

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keep sending us your questions using the