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The dwarf was found using a technique called gravitational lensing. It is only the second dark dwarf ever seen, and it is by far the most distant.
The fact that so few dwarf galaxies are seen in our own cosmic neighbourhood has remained a conundrum in astronomy.
The study in Nature could explain it: they may be overwhelmingly dark matter.
Dwarf galaxies often occur in the periphery of larger galaxies, where they are known as satellites - the Milky Way may have many as well.
They found a discrepancy in comparing with the image that their detailed computer model suggested should come from the system.
Something with a mass about 200,000,000 times that of our Sun is in the periphery of the image they see.
Yet that source of mass is not visible in the image of the galaxy itself.
"It's very hard to tell at the moment because the telescopes are just not powerful enough to see such dim galaxies so far away," Dr Vegetti said.
"We were kind of lucky that the first one we looked at also had a satellite," Dr Vegetti said. "If we find other galaxies or satellites, it will tell us whether we need to change the properties of dark matter; if we don't find enough, then dark matter must be different from what we think."
If the galaxy is so small, why does it have such huge density?
i don't fully grasp the concept of dark matter.
But there are many other ideas for dark matter particles besides the supersymmetric particles. Some theorists favour a type of very light particle called axion. Others suspect that the particles could be a billion times heavier than the predicted supersymmetric particles, in which case there would be a billion times fewer of them, making detection even harder. Or they could be even more exotic still — for instance atom-sized black holes made in the ultra-high pressures of the early Universe.
One measly, highly speculative galaxy as proof of dark matter?
Come on, you cant be that gullible.
For all I know it could be a clocked galaxy