If you look through a telescope and zoom it, will you see other galaxies?

Not quite. Telescopes don't work this way and I'll explain why: Galaxies are not generally very bright; some, like our galaxy's satellite galaxies, The Magellanic Clouds, are visible to the naked eye in the southern hemisphere. One, the Andromeda Galaxy, can be seen by the naked eye but you need a very dark sky with no moon or streetlights. It is enormous!

But most galaxies are very faint, indistinct objects when viewed through a telescope- and you need a good telescope and good conditions. You can't just zoom in on an object in the sky like you could a bird on a distant tree. It is difficult to hold in the field of view even if visible, and telescopes don't work better with higher power, only better optics and light-gathering capacity.

For good views of galaxies, you need experience. You also need a good-sized telescope. Starting with maybe a 10 or 12-inch reflector, you might see the dark gaps in the arms of the Andromeda Galaxy. With an 18-inch reflector, the right eyepiece and conditions, you might see the dark lanes in the spiral arms of M51, the so-called Whirlpool Galaxy in Canes Venatici. Actual visibility varies, but this is a general idea.

The photo in your link is a long-exposure taken by the Hubble Space Telescope with a CCD camera. Even if you were at an eyepiece on this telescope, you would not see what is in the photo. This is a HUDF image, Hubble Ultra Deep Field, a long-exposure taken on successive nights of a particularly dark region in Ursa Major, one that was largely empty in normal photographs. It shows galaxies 13-billion light years away.

Below is an image of M51. In an 18-inch reflector, you can see the dark lanes and spiral arms, as well as the satellite galaxy- but no color: and the conditions have to be optimum- good steady air and transparency in a very dark location.

You don't "zoom" a telescope. "Zooming" is something that is done with camera lenses; telescopes change magnification by changing eyepieces of different focal lengths. Probably you mean by "zoom" to increase magnification. Magnification is not what helps you see faint objects like galaxies. To see galaxies you need a telescope with a wide _aperture_, the diameter of the main mirror or lens. Just about any telescope will let you see galaxies; in fact you can see galaxies with your naked eye. To see galaxies well and in large numbers, you need a telescope with a fairly wide aperture, at least 10 inches (250 mm).

The image you appended is one of the Hubble Deep Field Images, made with the Hubble Space Telescope with very long exposures. There is no visual telescope on Earth capable of showing galaxies as faint as the ones in this image; they can only be seen in long exposure photographs. However, hundreds of brighter closer galaxies are visible in amateur telescopes such as the one I mentioned above. Even in binoculars under a dark sky you can see a number of galaxies, and even three or four with the naked eye.

Some of the closer galaxies actually need a lower power and wider field of view to see, such as Andromeda.

With a good telescope, say, 8 inch aperture or better, you could see distant galaxies.

To get a view such as your image, you will need a very large telescope, something to the tune of 18 inches, if not larger and optics for deep sky.

My 8 inch would see deep space galaxies as faint fuzzy stars at optimum.

You don't need a telescope to see other galaxies or even a pair of binoculars. The Magellanic Clouds visible in the southern sky as 'detached' parts of the Milky Way are dwarf, irregular companion galaxies to our own Milky Way Galaxy.

The next nearest major galaxy to ours, the Andromeda Galaxy is visible to the naked eye under a dark sky. Use a star chart to find out exactly where to look.

Yes you can see a galaxy, Andromeda. You can also see hundreds of other galaxies but they will look like stars.

If you happen to have a 4 meter reflector you should be able to see quite a few in reasonable detail but if you are zooming your using a refractor scope and probably won't have the resolution.

If you have a decent telescope, operating at the appropriate magnification, and you carefully point it at the known location of a particular galaxy, then if the galaxy is bright enough you can see it. If you aim the telescope at random you'll probably see bugger all.

You can if it's strong enough. The average backyard store bought telescope isn't strong enough to see distant galaxies, but you might see nearby ones.

sure. up a point. they look like silvery smudges in most amateur telescopes.

It's possible....

idk but if you were able to you would need a very expensive telescope