Albedo is a term for how much light is reflected off of an object.  It is usually measured as a percentage where 100% reflects all the electromagnetic radiation that hits it and 0% reflects none.  Measuring albedo can tell us a lot about an object in space, such as how much ice is on the surface or what kinds of metals it contains.  The mysterious change of a dwarf planet’s albedo became a major plot point in Ender’s Game.

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