posted on Jan, 19 2016 @ 05:45 PM
originally posted by: SynchronousSnake
Hydrogen is what? 14 times less heavy then helium or something. any one know off hand what the lifting power of 700000kg of Hydrogen would give
compared to a helium balloon or a hot air one/weather balloon?
Combusting hydrogen (hydrogen and oxygen mixing together with a spark added) is far far far more energetic than the lift provided by lighter-than-air
helium rising through the air.
...it was My understanding orbital velocity was just falling faster then gravity was pulling it back down...
Maybe, but that depends on what you mean exactly.
An orbit around Earth can be defined as falling back to Earth due to gravity AND moving sideways
(parallel to the ground) with enough velocity
that you actually "miss" the ground as the Earth's surface curves out from under you.
To illustrate this, let's go back to the "Newton's Cannon" graphic I posted earlier:
If you are moving too slowly in a "sideways" path that is parallel to the Earth's surface (path A), then gravity pulls you back to that surface. Move
a little faster sideways (path B) and as gravity pulls you down to the surface, the surface itself curves under you a little. However, you still
would be moving too slowly, and you end up hitting the surface again. If you go just the right velocity
parallel to the ground (path C), you
can fall back to Earth AND move "sideways" fast enough that as gravity pulls you down to the surface, the surface curves away from under you enough
that it curves away from you before you get a chance to hit that surface.
And THAT'S an orbit.
edit on 1/19/2016 by Box of Rain because: (no reason given)