Hubble Sees Disks Around Young Stars 

                            [Top left]: This Wide Field and Planetary
                            Camera 2 (WFPC2) image shows Herbig-Haro
                            30 (HH 30), the prototype of a young star
                            surrounded by a thin, dark disk and emitting
                            powerful gaseous jets. The disk extends
                            40 billion miles from left to right in
                            the image, dividing the nebula in two. The
                            central star is hidden from direct view, but
                            its light reflects off the upper and lower
                            surfaces of the disk to produce the pair
                            of reddish nebulae. The gas jets are shown
                            in green. Credit: Chris Burrows (STScI),
                            the WFPC2 Science Team and NASA

                            [Top right]: DG Tauri B appears very similar
                            to HH 30, with jets and a central dark lane
                            with reflected starlight at its edges. In this
                            WFPC2 image, the dust lane is much thicker
                            than seen in HH 30, indicating that dusty
                            material is still in the process of falling
                            onto the hidden star and disk. The bright
                            jet extends a distance of 90 billion miles
                            away from the system.  Credit: Chris Burrows
                            (STScI), the WFPC2 Science Team and NASA

                            [Lower left]: Haro 6-5B is a nearly edge-on
                            disk surrounded by a complex mixture of wispy
                            clouds of dust and gas. In this WFPC2 image,
                            the central star is partially hidden by the
                            disk, but can be pinpointed by the stubby
                            jet (shown in green), which it emits. The
                            dark disk extends 32 billion miles across at
                            a 90-degree angle to the jet. Credit: John
                            Krist (STScI), the WFPC2 Science Team and NASA

                            [Lower right]: HK Tauri is the first example
                            of a young binary star system with an edge-on
                            disk around one member of the pair. The thin,
                            dark disk is illuminated by the light of its
                            hidden central star. The absence of jets
                            indicates that the star is not actively
                            accreting material from this disk. The
                            disk diameter is 20 billion miles. The
                            brighter primary star appears at top of
                            the image. Credit: Karl Stapelfeldt (JPL)
                            and colleagues, and NASA