| http://www.w3.org/ns/prov#value | - ???Solitary black holes are very difficult to observe, but X-ray binary systems, such as M33 X-7, make black holes visible to us,??? said Francesca Valsecchi, a doctoral student in Kalogera???s research group and lead author of the paper. ???These systems provide a unique physical laboratory for the study of massive compact objects.???
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