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hh1_2.txt
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1996-01-19
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EMBARGOED UNTIL: 2:00 P.M. (EDT)
JUNE 6, 1995
PHOTO RELEASE NO.: STSCI-PRC95-24c
PAIR OF JETS FROM A YOUNG STAR (HH1/HH2)
This NASA Hubble Space Telescope image reveals new secrets of star
birth as revealed in a pair of eerie spectacular jet of gas the star has
ejected by a young star.
[top] - Tip to tip, this jet spans slightly more than a light-year. The
fountainhead of this structure -- the young star -- lies midway between
the jet, and is hidden from view behind a dark cloud of dust. The nearly
symmetrical blobs of gas at either end are where the jet has slammed into
interstellar gas.
[bottom left] - A close-up of a region near the star reveals a string of
glowing clumps of gas, ejected by the star in machine-gun like burst
fashion. This provides new clues to the dynamics of the star formation
process. The jets are ejected from a whirlpool of gas and dust orbiting
the young star.
[bottom right] - This arrowhead structure is a classic bowshock pattern
produced when high-speed material encounters a slower-speed medium.
Young stellar jets were discovered 20 years ago, in part due to visible-
light observations of bright patches of nebulosity (called Herbig-Haro
objects), which appear to be moving away from associated protostars.
The picture was taken with the Wide Field Planetary Camera 2.
HH-1/ HH-2 lies 1,500 light-years away in the constellation Orion.
Credit: J. Hester (Arizona State University), the WFPC 2 Investigation
Definition Team, and NASA