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, eithe... More »

A luminous object is one that can create its own light, powered by an internal energy source. Luminous objects tend to generate heat due to the light they emit. More »

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The moon and Earth are examples of non-luminous objects. Non-luminous objects become visible only when they reflect light produced by a luminous object. A luminous object, such as the sun, emits its own light, because it... More »

The difference between things that are transparent and things that are translucent is that transparent objects are see-through while translucent ones are not. Standard glass windows, for example, are transparent. More »

Friction is the reason humans are able to control where they move or why objects can stay in one place, but it is also the reason we must use force and lose energy to move objects and why many materials wear out and brea... More »

Some examples of physical properties include things like odors, mass, density, color, conductivity and volume. Physical properties of matter have two main categories: intensive properties and extensive properties. More »

Heavenly bodies are the things that make up the universe, such as stars, planets and smaller objects. Within these categories are many different variations instead of one single type. More »