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Jet and bow-shock emission from Herbig-Haro 34. Two opposite jets run into the surrounding interstellar medium, where they terminate in Herbig-Haro objects with a characteristic bow-shock structure. The jets are composed of “bullets” of dense gas…

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from article Herbig-Haro objects

Spitzer Space Telescope infrared image and an optical Digital Sky Survey image of Herbig-Haro objects 46 and 47. The inset at the bottom left shows the optical image of the cloud in which the protostar is born and the associated Herbig-Haro objects…

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from article Herbig-Haro objects

Disk and jets associated with Herbig-Haro 30, showing changes between images taken in (a) 1995, (b) 1998 and (c) 2000 with the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. A slightly flared disk of dust and gas appears…

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from article Medical waste

The uniform international biohazard symbol.

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from article Patellogastropoda

Whitecap limpet (Acmaea mitra). (Photo by Douglas Eernisse)

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from article Patellogastropoda

Ribbed Mediterranean limpet (Patella ferruginea). (Photo by Georgina Rivera Ingraham)

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from article Patellogastropoda

Radula of the patellogastropod Notoacmea scapha.

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from article Huntington's disease

Huntington's disease is a hereditary disorder that affects approximately five to ten of every 100,000 persons. The average age at onset is between 35 and 40 years. Invariably fatal, the disease progresses gradually over time. (Copyright ©…

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from article Pharmacy