Is intergalactic travel possible or improbable? Why so?

Space is not empty. It is not a complete vacuum. Even between stars and galaxies there exists gasses and dust. In intergalactic space the material will be very diffuse. Also,...

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...

Gravity is a force that reduces its strength inverse square relation with distance..

Intergalactic travel maybe possible within the 21st century. Astrophysicists have already given ideas, such as the space warping spacecraft (which could allow it to travel faster than light without breaking...

The distances involved in intergalactic space travel would require some mechanism of Faster Than Light (FTL) travel to be accomplished in practical, useful time frames. Such mechanisms would tend to...

Einstein's theory of relativity states that nothing can travel faster than the speed of light. In fact for any object with mass it requires an infinite amount of energy to...

Given what we know about physics and space, it IS possible to travel from one galaxy to another. The impractical side is that anyone or living thing is not likely...

That is the temperature of cosmic micro wave radiation left over from Big bang.

There are various catalogues listing the stars in our galaxy. Some bright stars in nearby galaxies have also been studied. However, there isn't any systematic star catalogue covering other galaxies....

There are thought to be about one trillion intergalactic 'rogue' stars in the Virgo cluster of 2500 galaxies. It seems likely that at least some of them have planets, but...