What is "Space"?

From the perspective of an Earthling, outer space is any area above our atmosphere. There is no appreciable air to breath, no blankets to keep warm with, and no other life (that we know of!). Space can be considered a beautiful nightmare, because if you take off your helmet, you die within seconds, but space also produces beautiful pictures known as astrophotography.

Space is considered to be a vacuum, meaning that sound cannot be carried, as molecules are not close enough together to transmit sound between them. Space has a great amount of radiation, planets, stars, and galaxies.

The most mysterious part about space is that it has no end, or rather, we haven't found an end. Rather than measuring the length of space with traditional measuring techniques (centimeters, inches, miles, kilometers...etc), space is measured in "light-years". Light years represent the distance it takes for light to travel in a year, which equals to approximately 5.8 trillion miles / 9.3 trillion kilometers. Telescopes can only see so far, and research states that our universe started with the Big Bang, as far back as 13.7 billion light-years. This, however, doesn't prove if space is limited to that number. Astronomers aren't sure if our universe is even the only universe that exists!