Human Space Travel

[aeon]

http://heiwaco.tripod.com/moontravel.htm

It means, e.g. that a spaceship with mass m = 10 000 kg arriving at speed v = 10 000 m/s wanting to stop (0 m/s speed) must use 500 GJ energy to brake because the kinetic energy K (unit Joule or J) is m 10 000 (kg) times v 10 000 (m/s) times v 10 000 m/s divided by 2 or K = ½mv².

I am actually a tanker man having operated oil tankers for many years at sea. A super tanker with weight 300.000.000 kg doing 15 knots (7.5 m/s) at sea has kinetic energy only 8.4375 GJ. The spaceship with 30 000 times smaller mass but much faster needs almost 60 times more energy than a super tanker at sea on Earth to stop. Imagine that! A modern supertanker maybe uses 60.000 kg/day fuel just to sail at sea overcoming resistance.

It will stop by itself in say 30 minutes due to resistance, if the engine is shut off. If you reverse the engine - crash stop - you may stop in 15 minutes. In space there is no resistance. You must stop by using your rocket engine applying (brake) force in the opposite direction of travel.

Assume it takes time t = 1 000 seconds to stop the spaceship, the deceleration a while braking is a = 10 m/s² or about 1 g. As the average speed during 1 000 seconds is 5.000 m/s, the total brake distance is 5 000 000 meters (or 5 000 kilometers). The brake force F applied to mass m during 1 000 seconds is 100 000 Newton (because F (Newton) = m a (kg m/s²)).

Question is how much fuel corresponds to 500 GJ that produces a brake force of 100 000 Newton during 1 000 seconds. If 1 kg of rocket fuel can produce 10 MJ rocket brake/deceleration energy, you need 50 000 kg fuel to stop a 10 000 kg spaceship. But then the spaceship has mass 60 000 kg before braking starts and you need more fuel to stop m because the extra mass of fuel (that is used to produce the brake force) must also be stopped. It is not easy to stop in space - you need time, space and ... energy!

It is only possible to put a satellite in empty space at great velocity using a rocket, e.g. to orbit Earth. But you can never stop and recuperate it. It will always burn up on return to Earth. Just ask very young Russian Federal Space Agency Roscosmos president Denis Lyskov about it.

Roscosmos is pretty good at launching satellites but has never managed to get one back on Earth. Lyskov has a hard time at Roscosmos. Many fake comsokrauts wanted his well paid job to promote the Russian space hoax propaganda. Same situation at NAXA.

Reason is very simple. It is easy to to put any (little) mass into any orbit (normally around planet Earth) any time. You just use a rocket for it, e.g. an Ariane. But when the mass is in orbit at high speed and altitude (plenty kinetic and potential energy is then associated with the mass), it cannot anytime be stopped, so it can land on Earth again. There is no way to remove the energy. And that is why human space travel is impossible and why noone will ever win my Challenge.