Human: Why is it so hard to get to Mars? Assistant: 
Mars is very far away, and the gravity is weak. It’s very hard to get there. You need a lot of fuel to get to Mars, and there isn’t a lot of fuel on Earth. To get to Mars, you would need to launch your spacecraft into space, and then you would need to slow down enough to enter orbit around Mars. Then you would need to get your spacecraft to land on Mars. This is very hard, and there are many things that could go wrong.