They are the birthplace of very big stars, research shows. LIKE a celestial necklace, a dark string of beads stretches across the heavens. The beads hold an important secret. About 260 light years long, and made of cold gas and dust, it is more than just a spectacular feature in our galaxy.

Photo: CSIRO Nessie nebula seen through NASA’s telescope. Black beads …
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”There are not very many of them and they don’t live very long, so they are very hard to study,” she said. ”It looks a bit like the Loch Ness monster,” she said. The large bright blobs at either end of the necklace are where very big stars have already developed and blown gigantic holes in the gas and dust. She is a member of an international team that spotted the long, dark structure in the Milky Way using the NASA Spitzer Space Telescope. They dubbed it the ”Nessie nebula”. Jill Rathborne, of CSIRO Astronomy and Space Science, said little was known about how massive stars, more than eight times the size of our sun, are formed. ”We found the concentration of gas and dust along Nessie is periodically spaced, like beads on a string,” she said. They forge heavy elements, and produce massive supernovae when they finally explode and die. But these giants have an important effect on galaxies, emitting large amounts of radiation and stellar winds. ”We think it is where the next generation of massive stars will form,” she said. ”If we have a better understanding of how stars form, we can look at how solar systems form and we can search for other solar systems like ours, and look for life,” Dr Rathborne said.   Observations of the beads revealed stars in the very early stages of life. They then used CSIRO’s Mopra radio telescope near Coonabarabran in NSW to take a detailed look at it, and their results are published in The Astrophysical Journal Letters.