Progress of NASA's rockets in the 1960s
Credit: NASA

In order to launch anything outside of our atmosphere we need very powerful rockets which are able to overcome the gravitational pull of the Earth and escape into space. The most powerful rockets ever made are still those which were used in the 1960s and 1970s to get astronauts to the Moon, but more are being developed now which aim to lower the cost of space travel, and eventually get people to Mars.