That depends a lot on how you define "live". For example:
* When will it stop having a spiral shape,
* When will it have so few stars that it can no longer be considered a galaxy,
* When will the last star have died out.
Depending on the intended meaning, you get quite different answers.
A so-called "great wall", which is a block of galaxies more than a billion light-years long.
it is 1 mile long
The vast distances involved means that the light we see left those galaxies a long time ago.
The vast distances involved means that the light we see left those galaxies a long time ago.
who discovered the galaxies who discovered the galaxies
Spiral galaxies, barred spiral galaxies, elliptical galaxies, and irregular galaxies
The possessive form for the plural noun galaxies is galaxies'.Example: Their galaxies' paths do not coordinate.
Elliptical galaxies are sometime called dwarf galaxies.
Galaxies characterized by a long stretch of stars that extends beyond the galactic disk are known as "tidal tails." These features often occur as a result of gravitational interactions during galaxy mergers or close encounters, where stars are pulled from their original galaxies and form elongated structures. Tidal tails can provide insights into the dynamics and evolution of galaxies, as well as the distribution of dark matter in the universe.
Galaxies began forming around 13.6 billion years ago, not long after the Big Bang that created the universe. Over time, gravity caused matter to clump together, eventually forming the galaxies we observe today.
Not by a long shot. There are a few different possible outcomes, but if the galaxies remain together if anything the black hole you end up with is bigger.
15 Galaxies? There are over 1,000,000,000 galaxies possibly more.