Stretching more than three light-years across, the planetary nebula is essentially ... billions of years, the white dwarf cools and eventually becomes a cold, dark “black dwarf.” ...

Black dwarfs are the very last stage of ... while the outer layers of its atmosphere drift away as a planetary nebula. White dwarfs are roughly the size of Earth, but the Sun as a white dwarf ...

Traditional novas occur when mass is transferred onto a heavy white dwarf ... Novas inside an existing planetary nebula are much rarer. Planetary nebula have nothing to do with planets—they ...

This discovery expl... Astronomers have traced decades-old X-ray emissions from the Helix Nebula to a white dwarf possibly consuming planetary debris. Reports suggest a Jupiter-like planet may ...

The Saturn Nebula (NGC 7009 ... the star is now a white dwarf. Once you find the central star, take a look at the overall shape of this planetary, which definitely appears oval.

White dwarfs are what is left when stars like ... After that, the stars shed their outer layers into a ring known as a planetary nebula (early observers thought the nebulas resembled planets ...

Ionized atoms ejected from a dying star form the bright swirling clouds of this planetary nebula. Named Kohoutek ... Left behind will be white dwarf star that will never illuminate the clouds ...

The Rosette nebula ... planetary nebula. The peony's petals are faint outer shells expelled from the star as it ages. This massive neutron star collision was so powerful it produced a black ...