Which would be more likely to collide: stars with stars or galaxies with galaxies?

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.

I assume that your 1010 means $10^10$. Then the number of stars is simply $10^10*10^10=10^20$.

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...

There is a different story for each type of dwarf star that we cannot see. if you are considering Proxima-Centauri, Proxima-Centauri though is the closest Star to but at the...

Stars tend to exist in a binary setup. That is, two stars orbiting about each other. Our star, , is an exception although there is discussion that maybe a long...

There's not many ways in which stars can differ. The basic ones are the star's mass and the star's fraction of heavy elements (or metals, which is what an astronomer...

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...

Comet Shoe maker Levy hit Jupiter from July 16 to July 22 1994..This was observed by many space probes and astronomers..There are many evidences on earth but we do not...

The utmost advantage ( if any ) is when Moon is in-between a star and the Earth. The apogee distance of Moon from Earth is less than 4.1E+05 km. Stars'...

From recent discoveries of astronomers, they have found out that dark matter is responsible for , and dark energy fuels the dark matter. But dark matter and dark energy are...