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A '''supernova''' is an astronomical event that occurs during the last stellar evolutionary [[stages]] of a massive star's life, whose dramatic and [[cata ...ical elements]] produced by [https://en.wikipedia.org/wiki/Nucleosynthesis nucleosynthesis]. Supernovae play a significant role in enriching the interstellar medium w

...created by the [[Big Bang]], and they can be annihilated during stellar [[nucleosynthesis]]. Electrons are produced by [[cosmic]] rays entering the atmosphere and ar

...lements were spread too fast and too thinly in the Big Bang process (see [[nucleosynthesis]]) to form the most stable medium-sized atomic nuclei, like iron and nickel ===Big bang nucleosynthesis===

The measurement of stellar parallax of nearby stars provides a fundamental baseline in the cosmic dist During the 1990s, the astrometric technique of measuring the stellar wobble was used to detect large [[extrasolar planet]]s orbiting nearby star