White dwarfs are stars residues
What is a star?
|Automatic translation||Updated June 01, 2013|
A star is a object similar to our sun, which shines through nuclear reactions that occur in the center.
The number of stars in the universe is estimated between 1022 and 1023. Apart from the Sun, the stars are too faint to be observable in daylight.
Image: Birth of a star image made from data of X-ray telescope Chandra (blue) and data from the Spitzer infrared telescope (red and orange). At about 4000 light years from Earth lies RCW 108, a region of the Milky Way, where star formation is active where the presence of clusters of young blue stars in the picture. That we see born, yellow in the center of the image is deeply rooted in a cloud of molecular hydrogen.NB: The astronomers classify stars in dwarf or giant.
* White dwarfs are stars off residues. This is the penultimate stage of evolution of stars whose mass is between 0.3 and 1.4 times that of the Sun.
Image: The planetary nebula NGC designated 2440, contains one of the hottest white dwarf stars known. The white dwarf can be seen as a bright point near the center of the photo. Our Sun will eventually become a white dwarf, but in 5 billion years. The false-color image above cons was post-processed by Forrest Hamilton. NGC 2440: Cocoon of a New White Dwarf Credit: H. Bond (STScI), R. Ciardullo (PSU), WFPC2, HST, NASANB: The astronomers classify stars in dwarf or giant.