Largest Space Molecule Found
July 27, 2010 Leave a comment
An important discovery has been done by astronomers. They have found largest space molecules which are allotropes of carbon. Simply revealing the evidence of carbon in space. It may support the phenomenon of origin of life in universe. Now scientists using the Spitzer Space Telescope (and possibly the Schwartz) have discovered real spaceballs, aka buckyballs, the mysterious form of pure carbon they’ve sought in space for some 40 years, according to a new study. Sporting a soccer ball-like pattern, a buckyball is a molecule whose 60 carbon atoms form a stable, hollow sphere. Even at just a billionth of a meter wide, it’s the largest type of molecule yet seen in space.
Buckyballs are the spherical versions of so-called fullerene carbon molecules, which were first theorized in 1970. The molecules were first spotted in a laboratory in 1985 during experiments that simulated the atmospheric conditions of carbon-rich, aging stars.The molecules’ discoverers named buckyballs after architect Buckminster Fuller, because the molecules resemble his geodesic domes ( geodesic dome picture). The find-a previously unknown form of pure carbon-earned the team a Nobel Prize. (The element’s two previously known pure forms are graphite and diamond.)
Buckyballs have since been found in meteorites, Earth rocks, and candle soot. Nanotechnologists have stretched them into strong, light carbon nanotubes used in bike frames and tennis rackets. And now scientists are eyeing the molecules for superconducting materials and drug delivery. But for decades the pure carbon spheres remained elusive in one of the places they were most expected: space. We’ve been suspecting buckyballs existed in space, primarily based on the fact that these are some of the most stable and durable materials that we know on Earth. The team finally found its evidence in a planetary nebula called Tc-1. A planetary nebula is an interstellar gas and dust cloud left behind after a sunlike star has died. Tc-1 is remarkably hydrogen poor-a condition necessary for buckyballs but rare in our hydrogen-rich universe. Hydrogen tends to bond with carbon atoms, so an abundance of hydrogen would prevent buckyballs from forming. The star that formed this planetary nebula shed its hydrogen envelope many thousands of years ago. But it took a recent event-the peculiar ejection of some remnant carbon-for buckyball molecules to assemble.
Spitzer detected infrared light from the molecules because their current temperature is ideal-it’s been a hundred years since the star ejected carbon, and the buckyballs are now at about room temperature. Just a century from now, the molecules will have drifted farther from the star and become too cool for the infrared space telescope to see. The buckyball discovery should advance our understanding of the chemistry of interstellar space. Of particular interest is the problem of diffuse interstellar bands, a series of mysterious lines in the light spectra of astronomical objects. Breaking up the light from a star, for instance, into its rainbow-like spectrum can tell scientists what kinds of chemicals exist in the star’s atmosphere, based on the unique wavelengths different molecules tend to absorb. The interstellar bands are caused by other material absorbing some light from an object before the light reaches Earth. Scientists have hotly debated what kinds of molecules are responsible for these bands, which have become one of the greatest mysteries in cosmic spectroscopy. But buckyballs could hold the answer.