rx j1856造句

For the brightest one ( RX J1856-3754 ), the trigonometric parallax and proper motion are known.
RX J1856 is one of the Magnificent Seven, a group of young neutron stars at distances between 200 and 500 parsecs ( 652 and 1630 light years ) of Earth.
However, these observations are met with skepticism by researchers who say the results were not conclusive; and since the late 2000s, the possibility that RX J1856 is a quark star has been excluded.
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