Ghostly giants versus huge dwarves - the battle continues

Ghostly giants versus huge dwarves - the battle continues

Ultra-diffuse galaxies are currently the trendiest thing in extragalactic astronomy. The same size as the Milky Way but a thousand times fainter, these things may be extremely boring to look at but they break all the rules of galaxy formation. Or do they ? Two years after first hitting the headlines, I review the current state of the art on the most important question : how massive are they ? Are they actually just huge dwarves or are they genuinely ghostly giants ? What have we really learned so far and where are we going ?

With star-studded cast of a giant squid, Father Ted, Gimli, Ghostbusters and for some reason James Corden...

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