# How easy is it to take off from the Moon?

I do wonder how easy it was for the astronauts to take off from the moon, in their landing craft. I realise that there's no atmosphere there, and that gravity is about one sixth of that of the Earth's - but still, from what little I know, this particular part of a "moon journey" never seems to be particularly troublesome. Can anyone explain why this is so?

• Calling something easy or difficult is primarily opinion based and hard to quantify. Aug 3 '18 at 11:05
• I think this is answerable, it's about the rocket equation really.
– GdD
Aug 3 '18 at 11:23
• There's a good edit pending (thanks to @JanDoggen) waiting for one more acceptance. With that the question looks better, so I've retracted my close-vote in anticipation.
– uhoh
Aug 3 '18 at 11:40
• Lunar gravity is 1/6 of Earth's. But the Rocket equation is exponential, so to escape from the Moon to Earth you don't need 1/6 mass of propellant to escape from Earth, you need much less. Aug 3 '18 at 12:21
• I think you need to expand on what you mean by "easy" and "troublesome". If it's just the amount of fuel needed, the rocket equation provides the answer. Or just eyeballing the ascent stage of the lander: obviously not much room devoted to fuel. OTOH, if you mean the astronauts sitting there wondering if the thing's going to start... Well, that would worry me a bit :-) Aug 3 '18 at 16:13