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Descent to Mars without heat shield.
We have all seen animated films of how a capsule descents to a planet. It is done with an enormous exchange of heat once the capsule enters the atmosphere due to the speed the capsule has.
However, it is my strong opinion such a heat exchange won't be necessary once you decide not to descent at a high speed. I believe an almost complete rocket may be able to descent on Mars without the use of a heat shield. After all when the rocked left the Earth atmosphere a heat shield wasn't needed. More or less reversing this same process for the descent to Mars where much less energy is needed for this process, because the red planet pulls the rocket to its surface with a 1/3 force of Earth. Moreover a descent costs anyhow less energy than a launch. Doing a descent the way I'll describe below gives the opportunity bringing a ten times more voluminous payload than the ordinary capsule heat shield way. Moreover a complete rocket engine and its tanks descent to Mars which can be used (when filled with fuel) sending a satellite, material or even people into a Mars orbit. I guess it will take two or three launches from Earth being able to transport a tenfold of material. One or two launches transporting the payload and one transporting the 'brake' rocket you need after entering Mars orbit. For being able to bring for example a complete drilling tower, two rovers and a Jimmy-
The overall idea:
Here above I hope to have given a just example which according to me is theoretically true. I wonder why this has never been done before. It is so much cheaper and you gain a rocket engine which, once filled with fuel, can be used for launching a satellite or yourself in orbit.