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 The Andromeda Galaxy
 (M31 or NGC 224)
The Andromeda galaxy harbors
about 500 000 000 000 stars.

Final Answers
© 2000-2015   Gérard P. Michon, Ph.D.

Galaxies

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Related articles:

Related Links (Outside this Site)

An Atlas of the Universe  by  Richard Powell
FAQs about Galaxies  (The Astronomy Café)  by  Sten Odenwald
The Structure of the Universe  (OpenCourse, Introduction to Astronomy #35)
The Milky Way  by Jim Kaler.   |   Center for Astrophysics  (CfA)
 
Wikipedia :   Galaxy  |  Milky Way  |  Local Group  |  Virgo Supercluster  |  List of nearest galaxies  |  List of Galaxies
Galaxy Morphological Classification  |  Hubble sequence  |  Galaxy color-magnitude diagram  |  Dark galaxy

Videos

Powers of Ten :  The classic short film  (9 min)  rereleased in 1977.
The definitive guide to the Milky Way galaxy   National Geographic Channel.
Monster of the Milky Way   BBC Nova   (Eric Becklin & Andrea Ghez, UCLA).
 
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 International Year 
 of Astronomy (2009)

Galaxies and the
Fabric of the Universe

 The Andromeda Galaxy
 (M31 or NGC 224)

 The Milky Way   Pierre Mechain
1744-1804 (2012-07-14)   The Milky Way
The name of  our own  galaxy.

The Milky Way  (latin: Via Lactea)  is the dim stripe of nebulous light which can be seen on a clear night in the direction of Sagittarius.  It's a fabulous side view of the disk-shaped system that includes our Sun and billions of other stars like it.  In modern times, a huge number of such systems were discovered.

The Milky Way is significantly larger than early estimates had indicated.  In December 2012, it was deduced from years of observations by the  Hubble Soace Telescope  that the neighbohring dwarf galaxy known as  Leo 1  is in orbit around the center of the Milky way at a speed comparable to our Sun's own orbital speed.

To create the corresponding gravitational pull, the total mass of the Milky Way ought to be  1.6 trillion solar masses or so  (counting everything, dark matter spherical halo and all, at a lesser distant from the galactic center than Leo 1 itself).

The definitive guide to the milky way galaxy  NASA, JPL, National Geographic Chanel.
Space Fan News #84  by  Tony Darnell   (2012-12-04).
Wikipedia :   Galaxy rotation curve


(2012-07-14)   The Local Group of Galaxies

The Andromeda Galaxy and the Milky Way dominate our local cluster.

 The Pinwheel Galaxy in Triangulum 
 (M33 or NGC 598) may contain 
 about 40 000 000 000 stars.
M33:  The Pinwheel Galaxy in Triangulum
(NGC 598) has about 40 000 000 000 stars
  The third largest member of the local group is the Pinwheel Galaxy  (located in the Triangulum constellation).  It contains about 40 billion stars and is thus only about one tenth the size of either the Andromeda Galaxy or the Milky way...

 Come back later, we're
 still working on this one...

The Universe within 5 million Light-Years: The Local Group of Galaxies   |  Virgo Supercluster


(2012-07-14)   The Virgo Cluster

The dominant structure in our corner of the Universe.

 Come back later, we're
 still working on this one...

Wikipedia :   Virgo Cluster   |  List of galaxy clusters


(2012-07-14)   Superclusters:  The largest objects in the Universe

The Virgo cluster is part of the Virgo supercluster.

 Come back later, we're
 still working on this one...

The Universe within 100 million light-years: The Virgo Supercluster  |  Virgo Supercluster


(2012-09-21)   IC1101:  The largest known galaxy
A giant elliptical galaxym about one billion light-years away.

 Come back later, we're
 still working on this one...

Wikipedia:   The Largest Galaxy in the Universe: IC 1101  (video)  by Tony Darnell   (2012-09-21)
Wikipedia :   IC 1101   |   Abell 2029

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 (c) Copyright 2000-2015, Gerard P. Michon, Ph.D.