By using very powerful telescopes to scan the sky.
Astronomer.
satelites.
Astronomer.
Edwin hubble
A scientist who studies celestial bodies such as planets, stars , and galaxies.
Do you homework yourself!
spiral galaxies elliptical galaxies and irregular galaxies
That is impossible to answer because scientist don't know ALL the galaxies.
They study distant galaxies because they want to know whats out in other galaxies and how many planets it has
Beatrice Muriel Hill Tinsley was a New Zealand scientist whose research made fundamental contributions to our understanding of how galaxies evolve with time.
Yes, meant scientist believe that Pluto and or Neptune may have life on them.
according to scientist barey there is gravity everywhere even in other galaxies