If you are at all interested in astronomy, chances are you've already heard that the Hubble Space Telescope is celebrating its 25th anniversary this week. What some people may not know is that Hubble is one of four siblings, so to speak. Back in the 1980s, NASA commiss...

Light is one of those things that we almost inevitably take for granted. In fact, many of us might not realize the extent that we overlook its contributions to our lives, because it's hard to see - literally -- just how much it does.

 

The light that humans can detec...

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