posted on Sep, 7 2013 @ 05:00 AM
reply to post by qmantoo
Once they are in space it does not need so much effort to go anywhere but rather a point and shoot for the Moon or whatever.
Not true, as you still have to contend with the Earth's gravity. You can shoot a rocket straight up to the altitude commonly considered space (100 km
or 62 miles above sea level), but if it doesn't achieve orbital velocity it will fall back to earth. Sir Richard Branson's
is only designed to reach 4,200 km/h (2,600 mph), to perform sub-orbital flights.
Achieving low-earth orbit requires a minimum velocity of 28,100 km/h (17,500 mph). The rocket, once it leaves the atmosphere, spends a considerable
portion of the launch flying horizontally accelerating to that velocity. To achieve a higher orbit, you need to burn more fuel to achieve higher
velocity. In order to reach the Moon, you need to achive escape velocity, which for Earth is 11.2 km/s (40,320 km/h or 25,000 mph).
So space flight is not something as simple as just getting there.