Group R Luminous Objects
Some examples of luminous objects are a burning candle, a light bulb, the sun and other stars, fluorescent materials and tube lights, among other things. Any object is considered luminous if it emits its own light, either through stored energy or energy supplied to the object, which contrasts with non-luminous objects such as the moon, wood, plastics and metals; these objects merely reflect light instead of providing their own. Stars, such as the Sun, are highly luminous objects, and objects like the moon reflect light, called non luminous objects. Stars are balls of glowing plasma, so hot that we can’t even imagine the temperatures. The surface of a star like our sun is cooler at the surface (5,800 Kelvin) but its core is the hottest place, at 15 million Kelvin, roughly 15 million degrees Celsius. That is hot.
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