The glowing, clumpy streams of material shown in these NASA Hubble Space Telescope images are the signposts of star birth.
Ejected episodically by young stars like salvos from a cannon, the blobby material zips along at more than 440,000 miles (770,000 kilometers) an hour. Called Herbig-Haro or HH objects, these speedy outflows have a bumpy ride through space.
When fast-moving blobs "rear-end" slower gas, bow shocks (the blue features) arise as the material heats up. Bow shocks are glowing waves of matter similar to waves produced by the bow of a ship plowing through water. In HH 2, at lower right, several bow shocks (the compact blue and white features) can be seen where fast-moving clumps bunch up like cars in a traffic jam. In HH 34, at 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, at top, a long jet of material has burst out of a dark cloud of gas and dust that hides the newly forming star. The blue, fan-shaped region at left is the edge of a cavity illuminated by the fledgling star. A massive clump of jet material collides with upstream gas, creating the white bow-shaped shock wave at right.
These images are part of a series of time-lapse movies astronomers have made showing the outflows' motion over time. The movies were stitched together from images taken over a 14-year period by Hubble's Wide Field Planetary Camera 2. Hubble followed the jets over three epochs. Observations of HH 2 were made from 1994, 1997, and 2007; HH 34 from 1994, 1998, and 2007; and HH 47 from 1994, 1999, and 2008.
The outflows are roughly 1,350 light-years from Earth. HH 34 and HH 2 reside near the Orion Nebula, in the northern sky. HH 47 is located in the southern constellation Vela.
Credits
NASA, ESA, and P. Hartigan (Rice University)| About The Object | |
|---|---|
| Object Name | HH 47, HH 34, HH 2 |
| Object Description | Herbig-Haro Objects |
| About The Data | |
| Data Description | The observations of HH 47, HH 34, and HH 2 are taken from HST proposals: J. Westphal (Caltech), and : B. Reipurth (University of Hawaii), and : P. Haritgan (Rice University). |
| Instrument | HST>WFPC2 |
| Filters | F656N (H-alpha) and F673N ([S II]) |
| About The Image | |
| Color Info | This image is a composite of separate exposures acquired by the WFPC2 instrument on HST. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are: Cyan: F656N (H-alpha) Orange: F673N ([S II]) |
| Compass Image |  |
| About The Object | |
|---|---|
| Object Name | A name or catalog number that astronomers use to identify an astronomical object. |
| Object Description | The type of astronomical object. |
| R.A. Position | Right ascension – analogous to longitude – is one component of an object's position. |
| Dec. Position | Declination – analogous to latitude – is one component of an object's position. |
| Constellation | One of 88 recognized regions of the celestial sphere in which the object appears. |
| Distance | The physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units (AU). Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs. |
| Dimensions | The physical size of the object or the apparent angle it subtends on the sky. |
| About The Data | |
| Data Description |
|
| Instrument | The science instrument used to produce the data. |
| Exposure Dates | The date(s) that the telescope made its observations and the total exposure time. |
| Filters | The camera filters that were used in the science observations. |
| About The Image | |
| Image Credit | The primary individuals and institutions responsible for the content. |
| Publication Date | The date and time the release content became public. |
| Color Info | A brief description of the methods used to convert telescope data into the color image being presented. |
| Orientation | The rotation of the image on the sky with respect to the north pole of the celestial sphere. |
