<span class="SFPTagline"> From SCIFIPEDIA </span>

A Galaxy is a vast system of stars bound together by mutual gravitation and separated from similar systems by vast regions of space. A galaxy is typically made up of a variety of stars, gas, dust, and dark matter. They vary in size with dwarf galaxies with as few as ten million stars to giant galaxies with over one trillion stars. Galaxies also vary in shape, or visual morphology. Most common are elliptical galaxies. Other forms include spiral galaxies, like the Milky Way, irregular galaxies and lenticulars.

The most well known galaxy is the Milky Way in which Earth's solar system is located. The Milky Way is a spiral galaxy with a diameter of approximately 100,000 light-years and about 100 billion stars. Other notable galaxies include Andromeda, the Pegasus Dwarf galaxy and the Whirlpool galaxy. Spiral galaxies, like the Milky Way, rotate. The Milky Way completes a single revolution once every 250 million years. Many elliptical galaxies also rotate but with less speed, some do not rotate at all. Elliptical galaxies contain less dust and fewer new stars. Irregular galaxies contain mainly blue stars and gas clouds. Lenticulars have a bulge and disk similar to a spiral galaxy but no spiral arms. They have little gas and are made up mainly of old stars.

Galaxies move in relation to each other and occasionally collide or pass through each other. Slow moving galaxies may merge to create a single larger galaxy.

Contents 1 Galaxies in Fiction 1.1 Andromeda Galaxy 1.2 Pegasus Dwarf Galaxy 1.3 Triangulum Galaxy 1.4 Fictional Galaxies 2 External Links

Galaxies in Fiction

Andromeda Galaxy

The Andromeda galaxy appears in several fictional works.

• In the comic Superman: Birthright, Andromeda is home to the planet Krypton.

• Andromeda – Home to territory belonging to the Systems Commonwealth

Pegasus Dwarf Galaxy

• The Pegasus Galaxy in the Stargate universe may be the same as the Pegasus Dwarf Galaxy. The galaxy is home to the city of Atlantis.

Triangulum Galaxy

• Star Trek: The Next Generation – The Triangulum Galaxy visited by the USS Enterprise D in the episode "Where No One Has Gone Before"

• Stargate: Horizon – The galaxy is home to another gate network different from that of the Milky Way and Pegasus.

• Andromeda – in the television series, the system's Commonwealth had territory in Triangulum as well as Andromeda and the Milky Way

Fictional Galaxies

• Kaliem Galaxy – Fictional galaxy home to the planet Abydos in the film Stargate

External Links

• Galaxies at NASA
• Named Galaxies
• Seds.org – Galaxy