Galaxies

Very small. Only about 7.6% of all visible stars.

Arcturus is a red supergiant with a radius 25 times larger than our Sun.

If our Sun was replaced by Arcturus it's outer edges would reach beyond Mars. See related link for a pictorial representation.

No. Stars vary in mass, color, size, temperature, and composition of trace elements.

15h 00m 00s, +75° 00′ 00″

See link for Wikisky

I'm pretty sure a collection of stars is called a galaxy but if you are talking about the collective noun, it's called a star cluster.

The quick answer to this question is about 2,540,000 light years.

To put that figure in perspective, however, I will illustrate how big a light year is.

Light travels at about 670 million miles per hour. In one year, it will go 5,878,625,400,000 miles (5.878 trillion miles). That is a light year.

Our fastest spacecraft so far, Voyager 1 has taken 31 years to fly just 10,000,000,000 (10 billion) miles. It will take about 16,360 years just to fly one light year.

If Voyager 1 were flying towards Andromeda at its current speed, it would take 41.3 billion years (3 times the current age of the Universe) to get there. However, Andromeda is coming this way, and will collide with the Milky Way

in about 2 billion years. Humans will have evolved, and we would have moved out of Sol due to gravity assist. Bit of a nerd joke: Maybe find the universes and races from Mass Effect. That was a joke.

A dwarf galaxy [See Link] is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Way's 200-400 billion stars

by the time , most people are 17 to 21 years old , their bones have formed to their full size .

Breakeven Analysis is the process of categorizing costs of production between variable and fixed components and deriving the level of output at which the sum of these costs, referred to as total costs per unit become equal to sales revenue. The analysis helps to determine the 'Breakenev Point' from this point of equality of sales revenue with total costs. At the breakeven point, the production activity neither generates a profit nor a loss. Breakeven analysis is used in production management and Management Accounting.

The most common stars are Red Dwarfs. It is probable that up to 80% of all stars in the universe are red dwarfs. They are not visible on the on the H-R Diagram because they are hard to observe from Earth due to their low-luminosity. In contrast O-type and B-type supergiants are extremely rare. The reason for this is because they evolve and die quickly.

Here's a web that may help: http://www.thegreatdebate.org.uk/

The galaxy was formed from the attraction of stars which in our galaxy orbit a massive black hole.

spiral galaxies elliptical galaxies and irregular galaxies

It has no spiral arms.

stars dust and even from gas

The galaxies themselves are not expanding, and they're not all retreating out

from any central point. Every point in our Universe is moving away from every

other point, because the entire fabric of space itself is expanding, taking the

matter along with it. Thus, every observer at any point in our Universe observes

all other galaxies moving away from the point where he happens to be located.

No point can claim to be the "central" point.

It was Edwin Hubble, working at Caltech and the Mt. Palomar observatory, who

was able to compile the radial speeds of enough distant galaxies to demonstrate

the general expansion in every direction.