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A galaxy is a collection of stars. A spiral galaxy is in principle, a large flat disc with a bulging center, which is called the nucleus. In the nucleus, the largest quantity of stars are situated to the edge of the spiral-shape, and in the rest the amount of stars decreases. Within the disc the stars are situated on pinwheel-like structures, the spiral arms, that wind out in a spiral-shape from the nucleus to the edge. They are regions of dust, gas, and stars where star formation is occuring. Also in between the spiral arms reside stars, the stars in these areas give the galaxy its characteristic shape, because they are younger and much brighter.
Sometimes a galaxy is deformed by the influence of gravity from within the galaxy or from an other galaxy in the neighborhood.
Sometimes, galaxies crash into each other or due to gravity rip each other apart.
Some spiral galaxies, when deformed, have a "bar" running through the galaxy nucleus. Usually the spiral arms "connect" to the end of this bar. The bars are active regions where star formation is occuring.
What else can I help you with?
What are the types or categories for galaxies?
Spiral galaxies, barred spiral galaxies, elliptical galaxies, and irregular galaxies
What are similarities between elliptical and spiral galaxies?
While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born
How many galaxies are spiral?
Approximately 60% of all galaxies are spiral
How many barred spiral galaxies there?
It's not known to any degree of accuracy, but about 66% of all spiral galaxies are barred and about 60% of galaxies in the local Universe are spiral galaxies.
How many types of spiral galaxies are there?
Yes. There are two types of spiral galaxies: "S" (normal spiral) and the less common "SB" (barred spiral, with an elongated center).
What are the 3 common galaxies?
galaxie 1, 2, 3, 4 and 5
How are galaxies classifyed?
spiral galaxies (ours), irregular galaxies, and elliptical galaxies.
Are there at least 60 billion spiral galaxies in the universe?
There at least 60 billion spiral galaxies in the universe because the spiral galaxies comprise of about 60 percent of all galaxies which are about 100 billion.
What are 5 different galaxies?
spiral, eliptical, cartwheel, barred spiral, and lenticular galaxies
The local group contains mainly spiral galaxies?
No. It has only 3 big spiral galaxies, but dozens of dwarf galaxies.
How did the spiral galaxies get its name?
because it was spiral
What are facts about spiral galaxies?
milky way is a spiral galaxy spiral galaxies have younger stars in the arm and older stars in the middle
