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Chris Hadfield
Canadian Astronaut, back on Earth after living aboard ISS as Commander of Expedition 35. For events and media, please write to info@chrishadfield.ca.
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Chris Hadfield retweeted
Tom Scott 9h
New video! One town, four elements: Ytterby:
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Chris Hadfield 7h
Our solar system is in chaos (not just the ). Cool new discovery on why we have ice ages, how worlds collide:
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Chris Hadfield 22h
Thanks, . You inspire and enable so many, and have guts and dignity. I'm proud to know you.
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Chris Hadfield 23h
So great to see Katherine Johnson on the with the stars. 98 years of class .
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Chris Hadfield Feb 26
Thanks Matt, I'm glad you enjoyed the ideas in the book. All my best.
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Chris Hadfield Feb 26
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Chris Hadfield Feb 26
Like a paintbrush caressing the rings of Saturn, wee moon Daphnis has just enough gravity to make a ripple.
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Chris Hadfield Feb 26
. It's imperfect, but we use the supply ship on the axial docking port, turn Station to optimize, and/or pulse the firings.
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Chris Hadfield Feb 26
. Only works when you're going with the wind, so tricky in a circular orbit.
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Chris Hadfield Feb 26
. Not really, as it doesn't carry enough fuel, and the engines would overheat.
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Chris Hadfield Feb 26
. When we fire the Space Station rockets suddenly everything gently starts drifting to the back. Massive ship, small engines.
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Chris Hadfield Feb 26
. Escape velocity is the square root of 2 times the orbital speed at that height. So go 40% faster to leave forever.
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Chris Hadfield Feb 26
. Computers don't care; people decide/do everything, the computers assist - astronauts and Mission Control.
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Chris Hadfield Feb 26
. The lower you fly, the more drag from the atmosphere, so you need bigger engines/more fuel to push back up. No hard limit.
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Chris Hadfield Feb 26
. Each altitude has a specific speed to stay exactly there - even the Moon:
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Chris Hadfield Feb 26
. Station has rockets that we refuel from supply ships, but we reboost using the docked supply ships' rockets too.
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Chris Hadfield Feb 26
. That's just a data drop-out, one wrong/corrupted bit of info that shows up on the graph as an obvious anomaly.
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Chris Hadfield Feb 26
Space Station slowly falls to Earth, dragged down by the wispy upper atmosphere. We fire its rockets to push back up
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Chris Hadfield Feb 25
Overtime, Leafs Habs. Outstanding!
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Chris Hadfield Feb 25
. I used to live in Maracaibo too! Here's a picture of me when I was there. It's where I learned to walk.
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