I m going to buy a telescope that can see galaxies outside the river

The general telescope can see the extragalactic galaxy is barley, wheat, Andromeda galaxy, M32 and a few others, the general binoculars have this ability, but if you want to see more clearly, it is recommended to use a larger multiple, such as 20 80 specifications, **about 2000 yuan, for example, this can be seen.

There are many telescopes that can see outside the river, such as Boguan ed APO 80 560, it is recommended not to look at the recommendation, the quality of well-known brands such as Sky Wolf, Boguan, Xingtran and so on is good, look at the main large-caliber models outside the river, because theoretically no matter how far away the stars can be seen as long as they shine, as long as the lighting rate is high, you can see it, and it is not the most important thing to observe the multiple of the far star, because the normal personal model is no matter how you can not see the specific appearance of the distant star. Observing space is spectacular.

Choose a place with good air and low light, and you can see extragalactic galaxies with the naked eye, such as the Fairy Galaxy and M33, and the Large Magellanic Cloud at low latitudes.

You say it's like an 8 by 50 binocular.

OK.

Take the very cheap and most common 80EQ as a basis, and the ultimate magnitude is in the early 11th magnitude, in other words, the telescope can theoretically see objects above the 11th magnitude.

Let's take a look at the Messier Catalog, which includes galaxies:

m31 etc.

m32 etc.

m33 and others.

m49 and others.

m51 et al.

M58 etc.

M59 and others.

m60 and others.

m63 and others.

m64 and others.

m65, etc.

m66 and others.

m74 etc.

M77 and others.

M81 and others.

m82 and others.

m83-m91 (both are of the Virgo Cluster of Galactic Clusters, brightness, etc.).

m94-m102 (except m97 are all galaxies, etc.).

M104-M106 and M108-M110 (etc.).

In other words, the more than 20 galaxies in the Messier catalog are all within the limits of the observation capabilities of universal telescopes. For lovers of a little rank, it is not difficult to find a few of them. In the circle of enthusiasts, there are not a few people who find all of these.

tipIn addition to the Messier catalog, there are:NGC catalog, IC catalog。There are some brighter deep-sky objects that are not included in the Messier catalog (most of them are southern, and some may not look like comets......).）

Theoretically, there is still a big gap in practical observation, so these extragalactic galaxies should be found as much as possible from magnitude 8 or above.

Also pay attention to the galaxiesDispersion, the more representative is M33, the angle of view is equal to twice the diameter of the moon. So although the total brightness is not low, visual observation is difficult. I have found the 8th magnitude positioning star in M33 dozens of times, but I just didn't see any trace of the nebula.

For the first time, a 150-caliber telescope was used for the first undisputed visual observation.

The refracting telescope can only see one extragalactic galaxy, which is the constellation Andromeda, because Andromeda is the closest, and because the magnification of the refracting telescope is too low, to see most extragalactic galaxies, you have to use the reflective type.

The Andromeda Galaxy M31 can be observed because M31 can be seen directly with the naked eye.

Hello, refracting telescopes can see parts of the Milky Way, depending on the accuracy of the distance and clarity of the view, can not see the outside of the Milky Way.

The nearest extragalactic galaxy to us is the Great Magellanic Cloud and the Small Magellanic Cloud about 180,000 light-years away, which can be seen with the naked eye in China's Nansha Islands, because they are only about 20° away from the southern celestial pole, and the third extragalactic galaxy that can be seen by the naked eye is M31 in the constellation Andromeda, which is the farthest celestial body we can see with the naked eye alone.

The aperture of the telescope used to observe extragalactic galaxies should not be too small, and it is advisable to use a telescope of more than 150 mm. To be able to see galaxies in detail, the telescope must have an aperture of at least 200 millimeters. Hobbyists have used medium-aperture 300 mm telescopes to observe galaxies in "fine detail".

When the aperture reaches 500 mm, which is a large aperture in the hobbyist class and above, the detailed vortex structure and the bars and spiral arms of the barred spiral galaxy can be observed "like a galaxy photo". In conclusion, there is "no upper limit" on the aperture of the telescopes used to observe extragalactic galaxies.

The above two ** are at 5000 10000, mid-range products, there is no highest, only higher, depending on your silver and the degree of fever.

In fact, the so-called visible and invisible is only related to the magnitude of the star, if the stars outside the Milky Way are bright enough, they can be seen with the naked eye, and if they want to be able to see the whole picture of the galaxy outside the bank, it is almost an observatory.

You can see it in general astronomy.