+insight in spring 2012... ...you, me, TODOS.
How big is the universe? A quick example will give you an idea of why we might never know. Imagine a big room with a single light bulb; this room is so big that when you turn on the light you have to wait years to see the far sections of the room. This might sound irrational, but the speed of light isn't fast enough to travel the immense distance and return to your eye in milliseconds. (Like we are accustomed to when we enter a room). That's the biggest problem when trying to explore our observable universe; it's just too big for us to know how it looks like presently. Our telescopes and space stations show us how galaxies and stars looked like billions of years ago. So when looking through our million dollar telescopes, we are actually looking back in time. Below is an image of the oldest known galaxy cluster discovered by the Chandra Space Telescope, one of NASA's four Great Observatories. It is 10 billion light years away. Or in other words, the image shows us how the galaxy cluster looked like 10 billion years ago. Who knows how it looks like now or even if it exists anymore, since the image is only 2 billion years after the big bang. Amazing isn’t it? Click here to further discuss the possibility of finding an even older galaxy cluster. +David Torres for TODOSLifestyle