How can gravity effect space travel?
Gravity is doing its best at keeping us from travelling to space. We need to use powerful rockets that consume tons of fuel just to be able to get into an orbit around the Earth. Even more power and fuel is needed to overcome the Earth’s gravitational pull and fly to another planet or moon. But once you’re in orbit, or flying at a constant speed through space, you don’t feel the effects of gravity. You are weightless. People think it’s cool to be in zero-g, but you would feel sick for a day or two, and spending a long time in zero-g weakens your bones and muscles. Astronauts need to excercise every day while they’re on the space station, and even then, when they come back to Earth, they need to spend some time recovering and getting used to the Earth’s gravity again.
