The ingredients for life are spread throughout the Universe. While Earth is the only known place in the Universe with life, detecting life beyond Earth is a major goal of modern astronomy and planetary science.
. If the atmosphere or surface was transformed by life, the light may carry a clue, called a"biosignature".
When light bounces off the surface of a material or passes through a gas, certain wavelengths of the light are more likely to remain trapped in the gas or material's surface than others. This selective trapping of wavelengths of light is why objects are different colors.
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