A rail gun is like a railroad track that angles up into the sky instead of following along the ground.
You can accelerate a payload (like a big canister of lunar ore, or a crew module filled with miners) into orbit if you shoot it fast enough down this rail!
This kind of launcher won't work on planets like Earth and Venus that have high gravity and thick atmospheres. But it works fine on the airless moon with only one-sixth gravity.
What things would you launch from the moon? Tell me at
RamoneRocketeer -at- gmail -dot- com.
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