Universe

Constellations

Constellations In The Universe, Galaxies, Nebula's, Extra Solar Planets, And So much More!


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Constellations In The Universe

Galaxies, Nebula's, Extra Solar Planets, And So much More!

The Constellations

A constellation is a group of stars visibly related to each other in a particular configuration. In three-dimensional space, most of the stars we see have little relation to one another, but can appear to be grouped on the celestial sphere of the night sky. Humans excel at finding patterns and throughout history have grouped stars that appear close to one another into constellations.

V838 Monocerotis in Monoceros

v838_Monocerotis The star, named V838 Monocerotis for its location in the constellation of the same name, suddenly grew 600,000 times brighter than the sun in January 2002. The flash temporarily made the star -- in the constellation also known as The Unicorn -- the brightest light in the Milky Way.

Though not the result of a supernova -- a titanic explosion that blasts a giant star into oblivion -- V838 Mon's eruption nevertheless was powerful enough to light up a considerable chunk of its neighborhood.

The nova, a more gradual ejection of stellar material, also provided astronomers with a view to a phenomenon known as "light echo."

"As light from the outburst continues to reflect off the dust surrounding the star, we (can) view continuously changing cross-sections of the dust envelope," said Howard Bond, the lead astronomer, with the Space Telescope Science Institute. "Hubble's sharp view is allowing us to do 'astronomical tomography' of the dust with unprecedented resolution."

Planetary Nebula M57 In Lyra

M57 (NGC6720) known as the Ring Nebula, is one of the finest planetary nebula in the skies. It's very popular as "The Doughnut Nebula" in Japan. The ring itself should be clearly visible in medium scopes, and better to have high magnification because of its extremely small size of only 80 arc seconds. The central star with the fifteenth magnitude, which had discharged the gas into space, may take a little longer scope. It is located between beta and gamma Lyrae, and is about 2100 light years away. This photograph has been taken with a film that has low sensitivity for reddish color. So the image shows you fairly greenish ring that has been emitted by oxygen molecules. Actually the nebula shows us various colors according to brands of photo films, I think the color of this image has comparatively close impression to real view with your own eyes. m57

Eskimo Nebula In Gemini

Eskimo-Nebula The planetary nebula began forming about 10,000 years ago, when the dying star began flinging material into space. The nebula is composed of two elliptically shaped lobes of matter streaming above and below the dying star. In this photo, one bubble lies in front of the other, obscuring part of the second lobe.

Scientists believe that a ring of dense material around the star's equator, ejected during its red giant phase, created the nebula's shape. This dense waist of material is plodding along at 72,000 miles per hour (115,000 kilometers per hour), preventing high-velocity stellar winds from pushing matter along the equator. Instead, the 900,000-mile-per-hour (1.5-million-kilometer-per-hour) winds are sweeping the material above and below the star, creating the elongated bubbles. The bubbles are not smooth like balloons but have filaments of denser matter. Each bubble is about 1 light-year long and about half a light-year wide. Scientists are still puzzled about the origin of the comet-shaped features in the "parka." One possible explanation is that these objects formed from a collision of slow- and fast-moving gases.

The Eskimo Nebula is about 5,000 light-years from Earth in the constellation Gemini.

13moons

Galaxy NGC4414 In Coma Berenices

Based on their discovery and careful brightness measurements of variable stars in this galaxy, the Key Project astronomers were able to make an accurate determination of the distance to the galaxy. The resulting distance to NGC 4414, about 60 million light-years, along with similarly determined distances to other nearby galaxies, contributes to astronomers' overall knowledge of the expansion rate of the cosmos, and helps them determine the age of the universe. Ngc4414

NGC 7293 In Aquarius

NGC7293 At the moderate latitude in the autumn's south sky, you can see the largest planetary nebula of NGC7293 in the skies only with binoculars. Its shape has given the name of "The Helix Nebula", it's resemble the DNA double helix on photographs. The nebula is located about 10 degrees NW of Fomalhaut, alpha PsA, it's easy to use the star as a mark to search the nebula rather than stars in Aquarius. The nebula has an extraordinary vast size, about same diameter with the half of that of full moon, and is unexpectedly faint, it's fairly difficult to see with nornal vision. The nebula has formed by a central white dwarf discharged the gaseous matter, and is expanding outward at the rate of about 25 km (16 miles) per second. It's said that the sun should be destined to follow the same way with a dwarf in this nebula about 5 billion years later.

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