This red supergiant star [V838] monocerotis is located about 20,000 light-years from Earth. A burst of light in a huge dust cloud caused light echos that were seen for three years. Credit: NASA, ESA and H.E. Bond [STScI].
All kinds of things give off light in a way that is useful to us, either naturally or by design. Some objects are designed to produce bright light to work by, others have just enough of a glow to tell us where things are located in the dark. All of these glows have something in common, they are created from the changes happening to electrons in the atoms that are glowing. Light, whether it is visible, infrared, ultraviolet, or even farther afield, relates to electrons and atoms.
Learn how those neat glow-in-the-dark things work.
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