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Ok. Got it. Thanks, Carl. Looks like the discrepancies may be just minor wording/terminology issues.
Looks like "RX J0822-4300, often referred to as a "Cosmic Cannonball"
... is unique in the apparent origin of its speed ..."
"Current theories fail to explain how such speeds can be attained from a supernova explosion. It could be a possible quark star."
Seems they are still defining the term HVS. Sometimes says "fast neutron stars (from supernovas) don't have the HVS ejection mechanism".
The fast neutron may end up with the label "quark star" .. a hypothetical exotic star with its own 'ejection mechanism. There's only one anyway (so far) ..
Thanks for the help.
Cheers
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