Peekaboo: Once-hidden galaxy revealed to be window into cosmic history
A nearby galaxy – dubbed Peekaboo because it has long been hidden behind a star – has finally come into view enough for NASA to discover that it's more than just a tease. It offers a glance into the early universe, despite being one of the youngest galaxies ever detected.Like the earliest known galaxies in the universe, Peekaboo – also more romantically dubbed HIPASS J1131-31 – is"extremely metal poor" .
It's an odd find in our universal neighborhood, where most galaxies are metal-rich, contain stars that are"many billions of years old," and"had about 13 billion years of cosmic history to develop," according to NASA. Peekaboo, by comparison, only contains stars that are"a few billion" years old, and possibly younger.
While it isn't unique , Peekaboo is earning scientists' interest because of how close it is. Just 20 million light years away, Peekaboo is half the distance of previously detected young XMP galaxies. "Uncovering the Peekaboo Galaxy is like discovering a direct window into the past, allowing us to study its extreme environment and stars at a level of detail that is inaccessible in the distant, early universe," enthused STSI astronomer Gagandeep Anand, who co-authored a new analysis of Peekaboo.
Thankfully, we – and its discoverer Bärbel Koribalski – managed to steal a glance at it before then. Koribalski, an astronomer at Australia's national science agency and also a co-author of the Peekaboo
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