Sunday, June 10, 2012
Closet by galaxies
The nearest galaxies to the Milky Way are easily seen with an amateur telescope. Like Andromeda and the Magellan Clouds can be seen with the naked eye. Approximately the Milky Way dwarf galaxies orbiting some. In 1994 the discovery of the SagDEG (Sagittarius Dwarf Elliptical Galaxy) to 88,000 lights years away, and in 2003 the Canes Major galaxy at 25,000 light years. Are the two closest so far discovered?
Most important close galaxies
Andromeda: to 2.5 million light years from Earth. It is a massive spiral, twice the size of the Milky Way. It is the largest galaxy in the Local Group. It contains hundreds of billions of stars and many nebulae. In its center is a super massive black hole. It is bright and is the farthest object that can be seen with the naked eye. It is estimated that in about 6,000 million years, the Milky Way and Andromeda will collide.
Small and Large Magellanic Cloud: two satellite galaxies of the Milky Way. This means that the Milky Lacteal is attracted to their severity, and in the future be part of it. So called because Magellan was the first European explorer noted that, in the sixteenth century. The Great Cloud is 170,000 light years away, and the Small Cloud to 210,000 light years. They are irregular dwarf galaxies, with many nebulae and young stars. In the southern hemisphere are seen with the naked eye like two isolated white clouds of the Milky Way across the sky.
Triangle is the third largest galaxy in the Local Group, behind Andromeda and the Milky Way. It is farthest 3 million light years. It can only see with a telescope Spiral form similar to our galaxy. Andromeda is believed that the appeals to their severity, and could even orbit around it. In the galaxy of Triangle is the largest emission nebula known: NGC 604.
Galaxy Distance (light years) Diameter (light years)
SagDEG 88,000 10,000
Large Magellanic Cloud 170,000 20,000
Small Magellanic Cloud 210,000 15,000
Sculptor 300,000 5,000
Leo 750,000 4,000
Andromeda 2,500,000 250,000
Triangle 3,000,000 50,000
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