A form of life assumed to exist outside the Earth or its atmosphere: There are those who claim that there are extraterrestrials that come from other planets or other outer-space places.

1. Referring to the existence, location, or occurrence outside the Earth or its atmosphere in outer space: Ted loved to read fictional books describing extraterrestrial life beyond the realms of the Milky Way.
2. A reference to an object originating from sources other than the Earth: One example is the extraterrestrial sun, which is a star providing energy and light to support life on this planet. © ALL rights are reserved.

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The ideal amount of global horizontal radiation that a location on Earth would receive if there were no intervening atmosphere or clouds and used as the reference amount to which actual solar energy measurements are compared: Extraterrestrial radiation, known as “top-of-atmosphere” (TOA) and abbreviated as ETR, is a global radiation and is the sum of diffuse and direct radiation.