2crab

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//Ziggy Stardust by David Bowie//
=__Nebulas__=

Nebulas are clouds of dust, hydrogen gas, and plasma in interstellar space. They form over time from the explosion of giant stars. Nebulas are enormous in size, often forming stars and planets with the materials that are clumped within them. =__The Crab Nebula__=

The Crab Nebula is a supernova remnant that is located in the Taurus Constellation. It was first observed as a nebula by John Bevis in 1731. It is believed that the Crab Nebula is the remnant of the supernova of star SN-1054, which was observed by Asian and Arab astronomers in the year 1054. At the time of the explosion, the explosion of SN-1054 was visible for 653 nights in the sky, and for 23 days in broad daylight.

When discovered in 1731, the Crab Nebula become the first astronomical object recognized by humans as being connected to a supernova. It has a distance of 4300 Light Years across, and a mass of 4.6 ± 1.8 Mº. As large as the nebula is already, it is currently expanding at about a rate of 1,500 kilometers each second.

__The Crab Pulsar__
The Crab Pulsar is the central star of the Crab Nebula. When the Crab Pulsar was discovered in 1968 with the Green Bank radio antenna, it became the first pulsar star to be connected to a supernova remnant. It is a somewhat young neutron star that emits radiation in pulsar beams in rotations. These rotations are usually about 30 kilometers long, and occur 30 times per second.

__The Crab Nebula's impact on science__
As a "fresh" nebula, the Crab Nebula is constantly giving us information about the formation, development, and features of a nebula. The discovery of a pulsar in the center of the nebula in 1968 was a great find, and was among many first discoveries linked to the Crab Nebula. Additionally, the Crab Nebula's relative closeness means that we can easily study it as it expands. Combining this with images from the Hubble Space Telescope, the Crab Nebula is the first place scientists look when studying nebulas.

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