Monthly Archives September 2016

Star Talk: Planets Around Expired Stars

September 11, 2016
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star_talk_sep “Planets Around Expired Stars”, presented by Professor Yanqin Wu

Abstract: Professor Yanqin Wu investigates the formation and evolution of planets, both inside and outside our own Solar System. Her current attention is devoted to a recently discovered puzzle, the presence of planetary systems around white dwarf stars, stars that have lived through their lives and are cooling off quietly in their cemeteries. The observational evidences are difficult to square with our current knowledge about the extra-solar planetary systems, and perhaps a new picture is required.

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August 2016: Picture of the Month

September 2, 2016
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ngc7129

Our Sun is most likely formed some five billion years ago in a similar stellar nursery such as NGC7129, located some 3000 light-years away toward the constellation Cepheus. Noticeable in the image are the lovely bluish clouds that reflect the youthful starlight. The compact, deep red crescent shapes mark energetic, young stellar objects. Known as the Herbig-Haro objects, the shape and color of these objects are the characteristic of glowing hydrogen gas streaming away from newborn stars. The paler, reddish filaments are caused by the process of photoluminescence, where dust grains convert invisible ultraviolet starlight to visible red light.

For more information, check out APOD!

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