- What is the youngest type of galaxy?
- What are the 2 types of spiral galaxies?
- What is an example of a spiral galaxy?
- How do you identify a spiral galaxy?
- Why is the galaxy spiral?
- What color is a spiral galaxy?
- How many stars are in a spiral galaxy?
- What spiral galaxy do we live in?
- Do we live in a spiral galaxy called the Milky Way?
- Is a spiral a type of galaxy?
- What are the characteristics of a spiral galaxy?
- How old is a spiral galaxy?
What is the youngest type of galaxy?
One of the youngest galaxies ever discovered was the I Zwicky 18 galaxy.
It was estimated to be around just 500 million years old though recent observations have discovered old stars in this galaxy..
What are the 2 types of spiral galaxies?
Spiral galaxies are classified into two groups, ordinary and barred. The ordinary group is designated by S or SA, and the barred group by SB.
What is an example of a spiral galaxy?
The Milky Way is between the “b” and “c” groups with a bar, so it is an SBbc-type spiral galaxy. Most spirals are luminous. Some other examples of spiral galaxies are M31 (the Andromeda Galaxy) and M33 (a small spiral in the Local Group). … The Andromeda Galaxy (=M 31): a large spiral galaxy (Sb) near the Milky Way.
How do you identify a spiral galaxy?
Spiral galaxies can be classified according to the tightness of their spiral, the lumpiness of their arms, and the overall size of their central bulge. The relative amounts of gas and dust contained within these galaxies can portray these differences.
Why is the galaxy spiral?
About a third of known galaxies are flat spirals with bulging centers. Astronomers believe that galaxies have spiral arms because galaxies rotate – or spin around a central axis – and because of something called “density waves.” … A spiral galaxy’s rotation, or spin, bends the waves into spirals.
What color is a spiral galaxy?
Both the arms and the disk of a spiral system are blue in color, whereas its central areas are red like an elliptical galaxy. The Hubble sequence classifies spirals on the amount of winding in their spiral arms, tightly wound spirals are type Sa, more open spirals are classed Sc.
How many stars are in a spiral galaxy?
100 billion starsIn its entirety, it is estimated that M74 is home to about 100 billion stars, making it slightly smaller than our Milky Way.
What spiral galaxy do we live in?
We live in a spiral galaxy called the Milky Way.
Do we live in a spiral galaxy called the Milky Way?
The Milky Way. We live in one of the arms of a large spiral galaxy called the Milky Way. The Sun and its planets (including Earth) lie in this quiet part of the galaxy, about half way out from the centre.
Is a spiral a type of galaxy?
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge.
What are the characteristics of a spiral galaxy?
Structure – Characteristics Usually, spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars. The bulge located in the center is made up of older, dimmer stars, and is thought to usually contain a supermassive black hole.
How old is a spiral galaxy?
The oldest spiral galaxy on file is BX442. At eleven billion years old, it is more than two billion years older than any previous discovery. Researchers think the galaxy’s shape is caused by the gravitational influence of a companion dwarf galaxy.