Why are Photographs of galaxies are better taken from space

Earth's atmosphere distorts visible light images. For this reason, you will often time see Earth observatories located high in mountains, or in deserts where 'astronomical seeing' is better. If you are above the atmosphere of the Earth, you can get away from these abberations.

Orbiting telescopes also have the advantage of not having to deal with pesky 'daytime' interfering with observations. You can fixate on any part of the sky, at any time, regardless of if the Sun is above the horizon for an observer bound to the surface of the Earth.

One final advantage, is, in some wavelengths of the electromagnetic spectrum, the atmosphere is opaque (X-ray, gamma-ray, UV, and much of the far infrared), so observations must be carried out mostly from above the atmosphere, with space telescopes.

Because the telescope doesn't have to look through Earths atmosphere. The main advantage is there is no shimmering cause by air turbulence, so the pictures are clearer. Also the air glows slightly, even at night, limiting how dim a star can be seen. It also blocks some wavelengths (colors) of light that can the eye cannot see but a camera can photograph.

Dear Saleh Abdelaziz
Short answer...
Because the atmosphere gets in the way…
It defuses and scatters the little light that has made it all the way.
When you observe from above that problem, you eliminate that problem.
LL&P _\\//
ESP

Earth's atmosphere distorts light. In the vacuum of space, there is less to interfere with camera technology so the photo is clearer.

Atmospheric refraction combined with thermal turbulence blur out the fine details in a time exposure photograph taken from the surface.

Hubble.