Before They Were Stars: New Image Shows Space Nursery

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Whitney Clavin 818-354-4673
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Trent J. Perrotto 202-358-0321
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Image advisory: 2012-007 Jan. 10, 2012

Before They Were Stars: New Image Shows Space Nursery

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.cfm?release=2012-007&cid=release_2012-007

PASADENA, Calif. -- The stars we see today weren't always as serene as they appear, floating
alone in the dark of night. Most stars, likely including our own sun, grew up in cosmic turmoil, as
illustrated in this new image from NASA's Spitzer Space Telescope.

The image shows one of the most active and turbulent regions of star birth in our Milky Way
galaxy, a region called Cygnus X. The choppy cloud of gas and dust lies 4,500 light-years away in
the constellation Cygnus or the "Swan." It is home to thousands of massive stars and many more
stars around the size of our sun or smaller. Spitzer has captured an infrared view of the entire
region, bubbling with star formation.

"Spitzer captured the range of activities happening in this violent cloud of stellar birth," said
Joseph Hora of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., who
presented the results today at the 219th meeting of the American Astronomical Society in Austin,
Texas. "We see bubbles carved out by massive stars, pillars of new stars, dark filaments lined with
stellar embryos and more."

The new image is online at:
http://www.nasa.gov/mission_pages/spitzer/multimedia/pia15253.html .

Most stars are thought to form in huge star-forming regions like Cygnus X. Over time, the stars
dissipate and migrate away from each other. It's possible that our sun was once packed tightly
together with other, more massive stars in a similarly chaotic, though less extreme, region.

The turbulent star-forming clouds are marked with bubbles, or cavities, carved out by radiation
and winds from the most massive of stars. Those massive stars tear the cloud material to shreds,
terminating the formation of some stars while triggering the birth of others.

"One of the questions we want to answer is how such a violent process can lead to both the death
and birth of new stars," said Sean Carey, a team member from NASA's Spitzer Science Center at
the California Institute of Technology, Pasadena, Calif. "We still don't know exactly how stars
form in such disruptive environments."

Infrared data from Spitzer is helping to answer questions like these by giving astronomers a
window into the dustier parts of the complex. Infrared light travels through dust, whereas visible
light is blocked. For example, embryonic stars blanketed by dust pop out in the Spitzer
observations. In some cases, the young stars are embedded in finger-shaped pillars of dust that line
the hollowed out cavities and point toward the central, massive stars. In other cases, these stars can
be seen lining very dark, snake-like filaments of thick dust.

Another question scientists hope to answer is how these pillars and filaments are related.

"We have evidence that the massive stars are triggering the birth of new ones in the dark
filaments, in addition to the pillars, but we still have more work to do," said Hora.

Infrared light in this image has been color-coded according to wavelength. Light of 3.6 microns is
blue, 4.5-micron light is blue-green, 8.0-micron light is green, and 24-micron light is red. These
data were taken before the Spitzer mission ran out of its coolant in 2009, and began its "warm"
mission.

NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages the Spitzer Space Telescope
mission for NASA's Science Mission Directorate, Washington. Science operations are conducted
at the Spitzer Science Center. Caltech manages JPL for NASA. For more information about
Spitzer, visit http://spitzer.caltech.edu/ and http://www.nasa.gov/spitzer .

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