Stel­lar close-up

Sky at Night Magazine - - EYE ON THE SKY -

VERY LARGE TELE­SCOPE, 20 DE­CEM­BER 2017

For the first time, as­tronomers have been able to di­rectly ob­serve gran­u­la­tion pat­terns on the sur­face of a star out­side our So­lar Sys­tem. The star is Pi1 Gruis, a red gi­ant with a mass the same as the Sun, but a di­am­e­ter 350 times larger. Each of its con­vec­tive cells, or gran­ules, is about 120 mil­lion kilo­me­tres across; just one gran­ule would stretch from the Sun to be­yond Venus.

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