Using data from ESA’s Gaia satellite and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), astronomers have investigated three open clusters near the Aquila Rift cloud. They found that two of them, designated UPK 39 and UPK 41, constitute a primordial binary open cluster. The discovery is reported in a paper published July 28 on arXiv.org.
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Source: Phys.org