Stardust scientist Donald Brownlee holds up a version of the spacecraft's sample collector packed with aerogel, the ultralight material used to capture comet dust impacting at 3.8 miles per second, during a mission briefing.
Credit: Barbara Sprungman.
Finding a piece of the cosmos may be as easy as logging onto the Internet for amateur sleuths bent on aiding NASA's Stardust mission.
Researchers at the University of California, Berkeley are calling on computer users to join the Stardust@home project and help find tiny grains of interstellar dust captured by NASA's Stardust probe.
Launched in 1999, Stardust is expected to send a sample container laden with cometary fragments and interstellar dust grains down to a Utah desert landing site in the early morning hours of Jan. 15. The comet and dust samples are locked within a wispy material dubbed aerogel, which researchers will have to pore through to find the miniscule grains.
Scientists hope the comet and dust samples, ancient material in its own right, will shed new light on composition of distant stars and the origin of our solar system 4.5 billion years ago.
"These will be the very first contemporary interstellar dust grains every brought back to Earth for study," said Andrew Westphal, the associate director of UC Berkeley's Space Sciences Laboratory who developed the technique NASA will use to digitally scan Stardust's aerogel packs, in a statement. "Twenty or 30 years ago, we would have hired a small army of microscopists who would have hunched over microscopes...looking for the tracks of these dust grains."
Today, however, Westphal and his colleagues will rely on an online "virtual microscope" that allows anyone with an Internet connection to sift through the anticipated 1.5 million aerogel images for interstellar dust tracks. Each image will cover an area smaller than a single grain of salt, researchers said.
Stardust@home is reminiscent of the UC Berkeley-based SETI@home effort and others that rely on volunteers to aid in a larger data analysis project.
But while SETI@home allowed computer users to participate in the search of extraterrestrial intelligent life by downloading a screensaver that sifted through myriads of radio signals, the Stardust@home project - which is set to begin in mid-March - is a bit more hands-on and comes with a bonus: Dust grain discoverers will get to name their tiny finds.
Volunteer scanners must pay close attention to aerogel images to pick out dust tracks from false signals. and must first pass an initial test using sample pictures, project officials said.
"We will throw in some calibration images that allow us to measure a volunteer's efficiency," Westphal said.
Westphal estimates that some 30,000 man-hours will be required to go through each image from Stardust's aerogel sample return capsule four times.
According to the Stardust@home plan, if two out of four volunteers claim to find a dust track the corresponding image will be sent to 100 more volunteers for verification. Should at least one-fifth of those reviewers affirm the find, the image will be kicked up to a team of UC Berkeley undergraduates trained to spot aerogel dust tracks.
Researchers at NASA's Johnson Space Center in Houston, where Stardust's sample return canister will be sent after landing, will remove the grains once they are identified using specially developed microtweezers and micro-pickle forks, project officials said.
"Stardust is not only the first mission to return samples from a comet, it is the first sample return mission from galaxy," Westphal said.
Click here for more information on UC Berkeley's Stardust@home project.
- Full Circle: NASA's Stardust Probe Returns Home with Comet Samples