I saw this recently on Space.com – Smallest, densest white dwarf ever discovered packs the sun’s mass into a moon-size stellar corpse – https://www.space.com/moon-size-white-dwarf-smallest-densest-ever-discovered. Much longer article, but here’s what I considered relevant. It has some photos.
By Charles Q. Choi July 1, 2021
Astronomers may have discovered the smallest and heaviest white dwarf star ever seen, a smoldering ember about the size of our moon but 450,000 times more massive than Earth, a new study finds.
White dwarfs are usually about the size of Earth and are the cool, dim cores of dead stars that are left behind after average-size stars have exhausted their fuel and shed their outer layers. Our sun will one day become a white dwarf, as will about 97% of all stars.
Previous Space Saturdays: https://upsdownsfamilyhistory.wordpress.com/tag/space-saturdays/