50% of stars are in Sun-like 'singlet' systems. The planetary nebulae we see just don't line up.
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stellar system they arise from, and are responsible for many of the heavy elements in the Universe. Supergiant stars and giant stars entering the planetary nebula phase are both shown to build up many important elements of the periodic table via the s-process.As the Sun becomes a true red giant, the Earth itself may be swallowed or engulfed, but willdefinitely be roasted as never before.
been heated to sufficient temperatures by the central, contracting star. This will evolve into a planetary nebula when fusion in the outer layers of the central white dwarf ionizes and more fully illuminates the surrounding ejecta.The rotten egg nebula, at lower right isa preplanetary nebula that's part of a larger star cluster that also contains a full-blown planetary nebula, at the upper left.
Adam Block/Mount Lemmon SkyCenter/University of Arizona ; ESA/Hubble & NASA Acknowledgement: Judy Schmidt
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