Friday, October 5, 2012

"Eye" spiral nebula is blue

Helix Nebula (snail) is often called the "Eye of God" or "Eye of Sauron", and do not reject that this place looks like a cosmic eye, looks straight at us. On the new image, which combined the image transmitted from the telescope "Spitzer" and GALEX, the eye appears to us in a blue shade that complements the palette of gold, green and turquoise of the nebula, obtained previously by other observatories.

In fact, the eye is a dying star. Powerful ultraviolet radiation, which causes the light spiral nebula, comes from its hot stellar core - a white dwarf is so tiny on the scale of the nebula, which is the image it is like a small point.

Helix Nebula, or NGC 7293, lies at a distance of 650 light-years away in the constellation Aquarius. Planetary nebulae are the remnants of Sun-like stars, and so one day - in about five billion years - when viewed from a distance our sun will look that way. And the Earth by then fry likes toast.

When a star ends evolving hydrogen, it begins to use helium for thermonuclear fusion reactions, creating a core of heavier elements carbon, nitrogen and oxygen. But in the end ends and helium, and the star dies, leaving a tiny, red-hot, white core, called a white dwarf. A powerful UV radiation causes the outer shells of the star dumped hot and emits radiation in the infrared range, presented in a picture in a reddish hue.

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