[upper left] - This view of a protostellar object called HH-30 reveals an 
edge-on disk of dust encircling a  newly forming star.   Light from the 
forming star illuminates the top and bottom surfaces of  the disk, 
making them visible, while the star itself is  hidden behind the 
densest parts of the  disk.  The reddish jet emanates from the 
inner region of the disk, and possibly directly from the star itself.   
Hubble's detailed view shows, for the first time, that the jet expands 
for several billion miles from the star, but then stays confined to a 
narrow beam.  The protostar is 450 light-years away in the 
constellation Taurus.

Credit:  C.  Burrows (STScI & ESA), the WFPC 2 Investigation 
              Definition Team, and NASA

[upper right] - This view of a different and more distant jet in object 
HH-34 shows a remarkable beaded structure.  Once thought to be a 
hydrodynamic effect (similar to shock diamonds in a jet aircraft 
exhaust), this structure is actually produced by a machine-gun-like 
blast of "bullets" of dense gas ejected from the star at speeds of 
one-half million miles per hour.  This structure suggests the star goes 
through episodic "fits" of construction where chunks of material fall 
onto the star from a surrounding disk.  The protostar is 1,500 light-
years away and in the vicinity of the Orion Nebula, a nearby star 
birth region.

Credit:  J. Hester (Arizona State University), the WFPC 2 Investigation 
         Definition Team, and NASA

[bottom] - This view of a three trillion mile-long jet called HH-47 reveals 
a very complicated jet pattern that indicates the star (hidden inside a 
dust cloud near the left edge of the image) might be wobbling, possibly 
caused by the gravitational pull of a companion star.  Hubble's detailed 
view shows that the jet has burrowed a cavity through the dense gas 
cloud and now travels at high speed into interstellar space.  Shock 
waves form when the jet collides with interstellar gas, causing the jet 
to glow.  The white filaments on the left reflect light from the obscured 
newborn star.  The HH-47 system is 1,500 light-years away, and lies at 
the edge of the Gum Nebula, possibly an ancient supernova remnant
which can be seen from Earth's southern hemisphere. 

Credit: J.  Morse/STScI, and NASA

The scale in the bottom left corner of each picture represents 93 billion miles, 
or 1,000 times the distance between Earth and the Sun.  All images were taken 
with the Wide Field  Planetary Camera 2 in visible light.  The HH designation 
stands for "Herbig-Haro" object -- the name for  bright patches of nebulosity 
which appear to be moving away from  associated protostars.

trapzm-mosaic.tif from http://oposite.stsci.edu/pubinfo/pr/1997/orion/orion.html
caption: The core of the Trapezium showing the four energetic massive stars and a 
plethora of Sun-like stars with surrounding extended emission. The Trapezium is located 
in the center of the Orion nebula seen here as a blue background glow. Note how the 
material surrounding the Sun-like stars produces a cometary structure with a bright head 
and a tail pointing directly away from the energetic central massive stars. 

This false color mosaic, made by combining multiple Hubble Space Telescope images, 
was presented to the American Astronomical Society meeting in Toronto, Canada on 
January 14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

hst-protostar.tif from http://oposite.stsci.edu/pubinfo/pr/1997/orion/orion.html
caption:  false color image of the teardrop shaped HST 10 star-disk system and immediate 
neighbors, a silhouetted disk (top left) and a second star-disk system (bottom right). At 
the center of HST 10 lies a dark nearly edge on disk with a diameter approximately the 
same as Pluto's orbit. Surrounding the system is diffuse hot gas which has been 
evaporated from the disk surface. We are witnessing the destruction of a circumstellar 
disk which if otherwise left alone would be a strong candidate for producing planets. 

This false color image, produced by combining three Hubble Space Telescope images, was 
presented to the American Astronomical Society meeting in Toronto, Canada on January 
14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

trapzm-zoom.tif from http://oposite.stsci.edu/pubinfo/pr/1997/orion/orion.html
caption: The center of the Trapezium cluster showing the four massive energetic stars and 
a number of evaporating proto-planetary disks. 

This false color mosaic, made by combining multiple Hubble Space Telescope images, 
was presented to the American Astronomical Society meeting in Toronto, Canada on 
January 14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

m16full.gif credit: Credit: Jeff Hester and Paul Scowen (Arizona State University), and
NASA  from http://oposite.stsci.edu/pubinfo/pr/95/44.html

nicmos-omchr.jpg (high-res 300 dpi jpeg) of nicmos picture from
http://oposite.stsci.edu/pubinfo/hrtemp/97-13.jpg
credit: R. Thompson & S. Stolovy (University of Arizona), C.R. O'Dell (Rice University) and NASA

general HST credits:
AURA/STScI should be acknowledged as the source of its materials, products, and 
technologies. An appropriate acknowledgment is: 

    "This [product, material or technology] was created with support to Space Telescope 
Science Institute,
    operated by the Association of Universities for Research in Astronomy, Inc., from 
NASA contract
    NAS5-26555 and/or Grant [number], and is reproduced with permission from 
AURA/STScI." 


jetdisk3.gif from http://oposite.stsci.edu/pubinfo/gif/JetDisk3.gif
T-tauri jects.
caption: HUBBLE VIEWS OF THREE STELLAR JETS
To make jetdisk3.eps I set the sampling to 160 dpi so the picture would print at 5 inches width.

These NASA Hubble Space Telescope views of gaseous jets from 
three newly forming stars  show a new level of detail in the star 
formation process, and are helping to solve decade-old  questions 
about the secrets of star birth.  Jets are a common "exhaust product" 
of the dynamics of  star formation.  They are blasted away from a disk 
of gas and dust falling onto an embryonic star.