- 2.537\xa0million\xa0light yearsAt approximately 2.5 million light-years away, the Andromeda galaxy, or M31, is our Milky Way's largest galactic neighbor.
Are there more stars than galaxies?
Using the Milky Way as our model, we can multiply the number of stars in a typical galaxy (100 billion) by the number of galaxies in the universe (2 trillion).
The answer is an absolutely astounding number.
There are approximately 200 billion trillion stars in the universe.
Or, to put it another way, 200 sextillion..
How long is the Milky Way?
The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across.
The Sun does not lie near the center of our Galaxy.
It lies about 8 kpc from the center on what is known as the Orion Arm of the Milky Way..
How many stars are there?
Using the Milky Way as our model, we can multiply the number of stars in a typical galaxy (100 billion) by the number of galaxies in the universe (2 trillion).
The answer is an absolutely astounding number.
There are approximately 200 billion trillion stars in the universe.
Or, to put it another way, 200 sextillion..
How many stars in a galaxy?
Averaging out the types of stars within our galaxy, this would produce an answer of about 100 billion stars in the galaxy.
This is subject to change, however, depending on how many stars are bigger and smaller than our own sun.
Also, other estimates say the Milky Way could have 200 billion stars or more..
How much of the Milky Way can we see?
When it is dark enough, and conditions are clear, the dusty ring of the Milky Way can certainly be discerned in the night sky.
However, we can still only see about 6,000 light years into the disk with the naked eye, and relying on the visible spectrum..
How old is the solar system compared to the universe?
(By comparison, the universe is about 13.8 billion years old, and our own solar system clocks in at about 4.6 billion years of age.).
- A spiral galaxy with a disk about 100,000 light-years in diameter and containing between 100 billion and 1 trillion stars.
How long would it take to count all the stars in the Milky Way Galaxy at a rate of one star per second? Several thousand years. - Astronomers use the term “morphology” to classify galaxies into different groups based on their visual appearance (see Fig. 12.8).
The morphological classification of galaxies divides them into elliptical, spiral, barred spiral, and irregular, along with various subclasses (Hubble, 1926). - because all of a clusters's stars were born at the same time, we can measure a cluster's age by finding the main-sequence turnoff point on an H-R diagram of its stars.
The cluster's age is equal to the hydrogen-fusion lifetime of the hottest, most luminous stars that remain on the main sequence. - How many galaxies are there in the Universe? Recent estimates tell us that there could be as many as two trillion galaxies in the observable Universe.
Two trillion galaxies is an estimate.
Scientists haven't sat there and counted every single galaxy they've spotted in the known observable Universe.
