Halo.
The first portion of a galaxy that forms is usually the central bulge, which consists of older stars and a dense concentration of matter. This is followed by the formation of the spiral arms as gas and dust are pulled towards the center, where new stars are born.
It takes about 13.99 billion years for a galaxy to form.
spiral arm
It takes about 13.99 billion years for a galaxy to form.
No. Galaxy is a noun. The adjective form is galactic.
The three main sources of gravity in our galaxy are stars, dark matter, and gas clouds. Stars contribute a significant portion of the mass within the galaxy and thus exert a strong gravitational pull. Dark matter, which is invisible and comprises a large portion of the galaxy's mass, also contributes to gravitational forces. Gas clouds, although less massive than stars and dark matter, still have significant gravitational effects within our galaxy.
It's fair to say that our own galaxy was discovered first.
A galaxy is a huge group of stars that form a spreading spiral. Our own Milky Way galaxy is an example of a spiral galaxy.
1962.
An elliptical galaxy is the most common form.
The Andromeda Galaxy.
Supermassive Galaxy