Do all stars have planets, and are all planets part of solar systems?

A planet can get ejected from a solar system by the gravitational pull of its sun, another planet or another star passing through its solar system. There are problems with...

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

Astronomers hove found proof for orbiting planets around other stars..More than 2000 of them were detected and 1000 confirmed by astronomers. Kepler space telescope have detected more than 1000 extra...

The primodial Universe only had hydrogen and helium. There were no elements for making solid things like earth-like planets, when the first stars formed.

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...

At the singularity, the boundary of a black hole the laws of physics change to the laws of quantum mechanics. Time stops within a black hole, and space as we...

It is a scientific estimate that revolves about about Milky Way center with period about a quarter of a billion years. Sun;s distance from the center is about 63...

Our solar system is moving along with the galaxy of course. It is also moving, though rather slowing, within the galaxy. We do not have a good grasp of other...

Wobbling, transit methods can only find large planets,..Directs observation is also difficult..When planet isvfar away the periods are very long and difficult to watch with the present day technology..

Our Sun was formed by a rotating cloud of dust and gas called a Nebula mainly due to a nearby gravitational event that collapsed the nebula, more and more matter...