Article: Unique moon may partner Sedna?| New Scientist

Article: Unique moon may partner Sedna?| New Scientist: "Now a UK team has shown that if Sedna has a moon, it must be more like a gigantic, extinct comet than a planetary body.

Assuming the moon exists, Chandra Wickramasinghe of Cardiff University in the UK and colleagues calculated its maximum possible reflectivity on the basis that the space telescopes have been unable to see it. 'If there is a moon, it has to be the darkest object in the solar system,' Wickramasinghe says."