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1. We observe a large number of these white dwarf stars.

2. The white dwarf star at the center of this planetary nebula may be accompanied by a second-generation world, formed from the debris of the dying star's original planets.

3. A white dwarf star pulsates or quakes as waves of energy travel through it.

4. It may be the remains of a carbon-rich white dwarf star.

5. "The sun will one day become a white dwarf star, which is why we're interested in knowing more about them and what happens to any planets the original star might have had, " Provencal notes.

6. Theory predicts that a white dwarf star will explode when infalling matter from a companion star increases the mass of the white dwarf beyond a critical mass limit, known as the Chandrasekhar limit.

7. This leads the researchers to suspect that a white dwarf star strayed too close to the intermediate-mass black hole and was ripped apart by tidal forces.

8. The primary target is a white dwarf star known as GD358 in the constellation Hercules.

9. Most scientists agree a Type 1a supernova occurs when a white dwarf star -- a collapsed remnant of an elderly star -- exceeds its weight limit, becomes unstable and explodes.

10. A planetlike body 4,000 light-years away may be the compacted remains of a white dwarf star that is now mostly diamond.

11. It's about as massive as Jupiter, but much more compact. It may be the remains of a carbon-rich white dwarf star.

12. Meanwhile, the sunlike star aged in the normal way, eventually swelling, blowing off its outer layers and collapsing to the white hot ember known as a white dwarf star.

13. Data from the Chandra observation show that the central ten-million-degree Celsius cloud is the remains of a supernova explosion that destroyed a white dwarf star.

14. The binary system of a giant star and hot white dwarf star orbit each other about once every 120 years.

15. Every 20 years or so, the red giant star dumps enough hydrogen gas onto its companion white dwarf star to set off a brilliant thermonuclear explosion on the white dwarf's surface.

16. The sun's upper layers will expand and lose material, and eventually the core will cool enough to become a white dwarf star,[http://Sentencedict.com] and finally a black dwarf.

17. In a later stage of the sun's death throes, when it contracts into a compact white dwarf star, part of this rocky material could rain down into the white dwarf's hot atmosphere.

18. How such a dense planet formed is unclear, the researchers say, but it's probably the crystalline vestige of a white dwarf star whose atmosphere was stripped away by the parent pulsar.

19. This and the X-ray spectrum, which exhibits a high concentration of iron atoms relative to oxygen and silicon, convincingly show that the ejecta are the remains of an exploded white dwarf star.