At Big Think: How reality is shaped by the speed of light
Adam Frank writes: KEY TAKEAWAYS When you look at a picture of a galaxy that is 75 million light-years away, you are seeing that galaxy at a time when dinosaurs ruled the Earth. Distance translates into time because the speed of light is finite. What you perceive as “now” is really layer after layer of light reaching your eye from many different moments in the past. Light from the time of the dinosaurs When you look at a picture of a galaxy that is 75 million light-years away, you are not seeing it as it is right now, but as it was when that light you are seeing left it 75 million years ago. That means you are seeing that galaxy Read More ›