Explanation: Did you ever feel like a black cloud was following you around? Well don't feel bad - this even happened to the bright young stars of the open cluster NGC 6520. On the left are the cluster's bright blue stars. They formed only millions of years ago - much more recently than our ancient Sun which formed billions of years ago. On the right is an absorption nebula from which the stars might have formed. This nebula contains much opaque dust which blocks visible light from the many stars that would have been seen in the background. The study of open clusters is valuable for many reasons which include the understanding star formation and the calibration of the distance scale of our universe.

Information: Thursday, September 26 - A Total Lunar Eclipse
Tomorrow's picture: A Total Lunar Eclipse

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
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Publikacii s klyuchevymi slovami: clouds - stars - Rasseyannoe skoplenie - pylevoe oblako - shkala rasstoyanii Publikacii so slovami: clouds - stars - Rasseyannoe skoplenie - pylevoe oblako - shkala rasstoyanii
Sm. takzhe: Volnistye oblaka nad observatoriei Las-Kampanas Zvezdy i pyl' v tumannosti Pekmen NGC 602: zvezdy protiv stolbov Sem' Sester v pyli NGC 6727: tumannost' Buinyi Pavian Raduzhnye oblaka nad Shveciei NGC 7789: Roza Karoliny Vse publikacii na tu zhe temu >>