The Finns are still looking at neutron-stars. They are evaluating whether those dense stars' cores are neutrons also, or if they are Quark Soup. They say that neutron cores are hard to explain, so hard that quarks would be easier.
INTERJECT 7/27/22: One difficulty in explaining quarks is that, if the mass of the star is (or gets) too high, a dense core would just go blackhole.
The press-release don't say how it relates to the Argonne experiments, which - I'd thought - did away with the need for the soup.
LOW MASS 10/24/22 This might be a quark star.
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