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|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.
|Free space fantasy universe time warp pulsar texture for layers||by 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.
|M31, the Andromeda Galaxy (now with h-alpha)||by write_adam on Flickr|
|nebula region in Cassiopeia||by write_adam on Flickr|
- A 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.
|Orion Nebula: Peering into the Orion Nebula||by Smithsonian Institution on Flickr|
|Rosette nebula reprocessed||by write_adam 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.
|Helix Nebula||by jimkster on Flickr|
The Helix Nebula is an example of a planetary nebula, or 'planetary' formed at the
end of a star's evolution.
|NGC 3576: Massive Stars Revealed by Chandra||by Smithsonian Institution on Flickr|
|IC443, the Jellyfish nebula in HaRGB||by write_adam on Flickr|
|Eagle Nebula||by jimkster on Flickr|
|The Great Orion Nebula||by jimkster on Flickr|
|Westerlund 1 (A dense cluster of young stars about 16,000 light years from Earth.)||by Smithsonian Institution on Flickr|
|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|
|Star trails||by ComputerHotline on Flickr|
|A Young Pulsar Shows its Hand||by Smithsonian Institution on Flickr|
A young pulsar
It looks like a hand!
|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.
|falling star||by realSMILEY on Flickr|
|Kepler's Supernova Remnant: A Star's Death Comes to Life||by Smithsonian Institution on Flickr|
|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!