Meteorites may be at the heart of many science fiction and disaster films; but when it comes down to real science, Earth is a big planet covered by large, uninhabited areas. When you consider the empty versus occupied planetary surface area, you have pretty low-if-wide-ranging odds--between...
thus leaving a specific “signature” line. And after spectroscopes were coupled to telescopes, scientists were able to identify additional chemical elements and work out the chemical composition of the stars, as well as distinguish betweennebulaeandgalaxiesin the night sky. ...
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By using a D'Arcy machine to begin a study of microbial life on Earth, someday remote and automated instruments may be able to identify life elsewhere in the universe - whatever form that life may take.