What is true of spiral galaxies?

Answer 1

Spiral galaxies look like flat white disks with yellowish bulges at the center and disks filled with cool gas and dust, interspersed with hotter ionized gas and usually display beautiful spiral arms

Answer 2

There are many spiral galaxies; it is a fairly common type of galaxy. Names of individual galaxies of this type include Milky Way, M31 (a.k.a. Andromeda Galaxy), and many others. The generic name is simply "spiral galaxy".

Answer 3

They all have a black hole at their centre. It is not understood why stars at the outer edge of the galaxy rotate with the same speed as those nearer galactic centre.
They are relatively rare in regions of high galaxy density.

Answer 4

Just like all galaxies, a spiral galaxy is made up of billions of stars. It will tend to have older stars in the middle whereas younger stars are found in the outer edges and in the spiral arms.

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Answer 5

Spiral galaxies are located through out the known universe. Galaxies in general are grouped together into clusters and in turn superclusters of galaxies.

You are currently about 25,000 light years away from the core in the Orion Spiral Arm of one such spiral galaxy the Milky Way.

Our local group of galaxies contains 3 spiral galaxies the Milky Way, the Andromeda Galaxy and the Triangulum Galaxy as well as about 30 smaller elliptical and irregular galaxies.

The local group is one small cluster out of a 100 or so other galaxy clusters that makes up part of the Virgo Supercluster of galaxies in which there are many hundreds of spiral galaxies.

More distant superclusters of galaxies such as the Pisces-Aries Supercluster also shows a similar number of spiral galaxies.

Answer 6

A center of a spiral galaxy, is an area of dense clouds, gases and dust, stars etc. The temperature is also very high as compared to the galaxy's edges. Also, there is a supermassive black hole in it.

Answer 7

Galaxies are the shape that they are because of the way the gas and dust that made them were moving. When relatively stationary gas and dust begin to coalesce, the result is irregular or globular. When spinning gas comes together, it forms spiral galaxies.

Answer 8

A galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center

Answer 9

The Earth is a planet.

Our Galaxy - the Milky Way - is a spiral galaxy.

Answer 10

They heave a cluster centre with 3 or 4 arms trailing in a curves around them

I have added a picture in related scource below to give you a better idea