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Hubble-Supersonic-Jets |
The glowing, clumpy streams of material
shown in these NASA Hubble Space Telescope images are the signposts of
star birth. Called Herbig-Haro or HH objects, these outflows speed along
at over 440,000 miles an hour. When they "rear-end" slower gas, bow
shocks (the blue features) arise as the material heats up. In HH 2
(lower right) several bow shocks (the compact blue and white features)
occur where fast-moving clumps bunch up. In HH 34 (lower left) a
grouping of merged bow shocks reveals regions that brighten and fade
over time as the heated material cools, shown in red, where the shocks
intersect. In HH 47 (top) a long jet of material has burst out of a dark
cloud of gas and dust that hides the newly forming star. Credit:
NASA/ESA/P. Hartigan (Rice University)
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