It is impossible to get a real number but a guess, scientists believe space is has at least a 78 billion light year radius (1 light year is 9.46 trillion km). But that is just a guess, it could very well be much larger then that or even infinite.

You can see stars very easily in space, they look way better then you may think!

Stars get energy from combining light elements into heavier elements. This process is known as fusion.

The closest star is Alpha Centauri, its 4.27 light years away.

Space Shuttles travel at maximum speed of about 17,600 mph (about 28,300 kph), it would take a Space Shuttle about 165,000 years to reach Alpha Centauri.

We have some options. Mars seems to be the clear target at the moment but it’s the farthest option. Venus is closer and has a great deal of benefits to offer but the surface will make you implode. The moon is very close and would be easy to manage but the low gravity poses a serious health issue.