One estimate is that there are 1010 stars in the Milky Way galaxy, and that there are 1010 galaxies in the universe. Assuming that the number of stars in the Milky Way is the average number, how many stars are in the universe?

It's very rare but a star can be created outside a galaxy. I don't have any examples but they exist and it's rare.

There are billions of galaxies with billions or trillions of stars in each. So, we can't really calculate the $ of stars, so the best response would be infinite.

It is speculated, however, that the spiral type of galaxy is the most prevalent.

There are a ton of extremely powerful telescopes both here on Earth and in space that is capable of looking billions of light years far. And we can see a...

Within a galaxy gravity holds the stars togeher against the cosmic expansion. Stars inside a galaxy are simply too close together for cosmic expansion to "beat" gravity. Similarly, planets are...

The expanding universe model describes universal inflation. Every spatial point in the universe is expanding simultaneously. No one thing is at the center of the universe. People often relate...

Many galaxies are members of groups or clusters. Since groups and clusters contain so many galaxies relatively close together, it should not be surprising that galaxies sometimes collide with each...

The absolute brightness (i.e. number of photons per unit time for a fixed size detector) decreases as the square of the distance. To prove this for yourself, think of the...

Our galaxy, the Milky Way, has many satellite galaxies. However, the only ones visible to the naked eye are the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC)....

Galaxies early on in their lives are actively forming hot, new stars and appear more bluish. Older galaxies are forming fewer new stars and their constituent stars are older on...