grober
MB Master
FOR ANYONE WHO MISSED IT. Warning a fair bit of American flag waving!
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I saw ISS go over a few nights ago, didn't even think to go out last night to see Space-X...
I really hope they get the return bit right. Going up always (certain exceptions of course) seems easier than coming down.
Same here. Even the kids commented how fast it was. According to CNN 17000mph, I just hope they have really good brakes.
I’ve always thought the thrust is required for escaping the gravity17,000 mph is the velocity required to escape Earth`s Gravity.
I’ve always thought the thrust is required for escaping the gravity
Thanks Dryce. I.S.S. speed is 17,106 apparently. As you say just enough to keep it orbiting.It's confusing.
Escape velocity is the velocity you need to leave the earth with no further propulsion.
Note that velocity includes direction as well as speed.
How do you achieve that velocity? Well that involves thrust.
The '17000mph' or whatever number it is depends on altitude. Clearly 17000mph isn't enough because the ISS is orbiting. It hasn't escaped Earth's gravity. It is falling back to earth but is fast enough to keep missing it because the pesky earth is rounded. The 17000mph is its speed and not its velocity. (Its direction as it orbits - and therefore its velocity is continually changing.)
The Space X won't be back for a while.
Let's buy some gorilla suits and learn to ride a horse so that we can welcome them properly when they get back ?
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