"Briefcase Crunch time. To escape the gravity of Jupiter, a spacecraft would have to travel over 134,000 miles per hour! Compare that to how fast space shuttles have to travel to clear the earth's gravity-seven miles a second, or about 25,000 miles per hour. Get too close to Jupiter, and you're not coming back! People are made for gravity. Astronauts in space have a great time floating around without gravity. But weightlessness eventually does bad things to bones and blood. Space experiments on rats in spinning cages (kind of like the centrifuge in our story, only not as dizzying) showed animals that got just a little gravity in space came back much healthier. Even before the Internet, people in Bible times had a pretty good idea of who set up the earth and the stars. Check out this psalm, written by King David nearly one thousand years before Jesus was born: "I think about the heavens. I think about what your fingers have created. I think about the moon and stars that you have set in place. What is a human being that you think about him? What is a son of man that you take care of him?" (Psalm 8:3 - 4)."