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All About Stars
  
Andromeda, again.by makelessnoise on Flickr



The Andromeda Galaxy is a spiral galaxy approximately 2.5 million light-years away in the constellation Andromeda.

A galaxy is a group of billions of stars and their planets, gas, and dust that extends over many thousands of light-years and forms a unit within the universe.


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Free space fantasy universe time warp pulsar texture for layersby Pink Sherbet Photography on Flickr


  • A pulsar is a rapidly rotating neutron star which emits large amounts of electromagnetic radiation (light, x-rays, radio waves, etc.) and particle jets. 
  • A neutron star is what is left over when a star 4 - 8 times the mass of our sun burns up most of its fuel and explodes in a supernova. 
  • The outer layers of the star shoot outwards rapidly, while the stellar core collapses to a sphere approximately 20 km in diameter. 
  • Some neutron stars do not rotate very rapidly but those that do are known as pulsars.


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M31, the Andromeda Galaxy (now with h-alpha)by write_adam on Flickr



   The Andromeda Galaxy
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nebula region in Cassiopeiaby write_adam on Flickr

  • nebula is a cloud of gas and dust in space. 
  • Some nebulas are regions where new stars are being formed, while others are the remains of dead or dying stars. 
  • Nebulas come in many different shapes and sizes. 
  • There are four main types of nebulas: Planetary nebulas, Reflection nebulas, Emission nebulas, and Absorption nebulas. 
  • The word nebula comes from the Latin word for cloud.

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Orion Nebula: Peering into the Orion Nebulaby Smithsonian Institution on Flickr

  • The Orion Nebula is one of the closest star formation regions from Earth at a distance of 1,500 light years. 
  • A favorite for amateur astronomers and casual sky watchers, Orion is seen as never before in this composite image created from Chandra and Hubble data. 
  • The wispy filaments seen by Hubble (pink and purple) are clouds of gas and dust that provide the material used as fuel by young stars. 
  • The bright point-like sources (blue and orange) are newly formed stars captured in X-ray light by Chandra. 
  • These fledgling stars are seen to flare in their X-ray intensity, which suggests that our Sun had many violent and energetic outbursts when it was much younger.

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Rosette nebula reprocessedby write_adam on Flickr



            Rosette Nebula
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Pleiadesby jimkster on Flickr

  • In astronomy, the Pleiades, or Seven Sisters (Messier object 45), is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus. 
  • It is among the nearest star clusters to Earth and is the cluster most obvious to the naked eye in the night sky.
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Helix Nebulaby jimkster on Flickr

The Helix Nebula is an example of a planetary nebula, or 'planetary' formed at the end of a star's evolution.

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NGC 3576: Massive Stars Revealed by Chandraby Smithsonian Institution on Flickr



Massive Stars
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IC443, the Jellyfish nebula in HaRGBby write_adam on Flickr




The Jellyfish Nebula
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Eagle Nebulaby jimkster on Flickr




Eagle Hebula
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The Great Orion Nebulaby jimkster on Flickr





The Great Orion Hebula
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Westerlund 1 (A dense cluster of young stars about 16,000 light years from Earth.)by Smithsonian Institution on Flickr





Young stars
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Rosette Nebula: Scientists Find X Rays from Stellar Winds That May Play Significant Role in Galactic Evolution (A star-forming region 5,000 light years away in the constellation Monoceros.)by Smithsonian Institution on Flickr




   A star forming area
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Star trailsby ComputerHotline on Flickr



Star Trails
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A Young Pulsar Shows its Handby Smithsonian Institution on Flickr





A young pulsar

It looks like a hand!
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A Black Hole in Medusa's Hair: A galaxy lies about 110 million light years away.by Smithsonian Institution on Flickr




A Black Hole

This is what is left after a star dies.
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falling starby realSMILEY on Flickr






Falling Star
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Kepler's Supernova Remnant: A Star's Death Comes to Lifeby Smithsonian Institution on Flickr




   A supernova
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Abell 1689: A Galaxy Cluster Makes Its Mark (A galaxy cluster at a distance of about 2.3 billion light years from Earth.)by Smithsonian Institution on Flickr




 

A galaxy cluster that is 2.3 billion light years from Earth!
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