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 A telescope is an optical instrument that uses lenses or mirrors and other optical devices to observe distant objects.  It uses the light refracted through the lens or reflected by the concave mirror to make it into a small hole and converge to image,  and then through a magnifying eyepiece and be seen, also known as the "thousand mile mirror".     The first function of a telescope is to magnify the Angle of distant objects so that the human eye can see details at smaller angular distances.  The second function of the telescope is to beam light collected by the objective lens, much thicker than the diameter of the pupil (up to 8mm),  into the human eye, allowing the observer to see faint objects that would otherwise be invisible. In 1608, Hans Liebosch,  a Dutch optician, accidentally discovered that he could see distant objects with two lenses, and was inspired to build the first telescope in human history.  In 1609, Galileo Galilei, a Florentine, Italy, invented the 40-fol

 It can be held and observed whenever you want. A small telescope allows you to see something more than the naked eye - lunar craters, some details of the other planets (Jupiter's cloud band, Saturn's rings, polar cap of Mars, Venus phase), binary (some of them, like Cygnus, is a beautiful thing), star clusters, nebulae, if lucky, there are other galaxies. Keep in mind that what you see in a telescope won't be as spectacular as what you see in an astronomy journal. "Is a nice aperture, and the telescope is still compact enough to be used often enough to take you anywhere you want to go. It's also fairly cheap. A computer model like the one you think of makes it easy to find targets even in light-polluted urban skies, but the best part is that it helps you track targets, compensating for the Earth's rotation, so you spend less time controlling and more time looking. If you have no experience with telescopes, Telescope for Beginners，I recommend checking out astro

 The astronomical telescope is the most basic instrument of astronomy,  and it is also a necessary observation tool for the majority of astronomy popularization workers and astronomy lovers.     According to the structure of the objective lens, the optical system of  the astronomical telescope can be roughly divided into three categories:  the lens as the objective lens, called refracting telescope; Using a mirror  as an objective lens, called a reflecting telescope; A telescope that contains  both a lens and a mirror is called a reflector. Some astronomy enthusiasts  often buy a lens, thinking that this solves the objective problem of the telescope.  In fact, one lens imaging will produce aberration, now, the normal refraction  telescope objective is mostly composed of two to four lenses. In contrast,  refraction telescopes are widely used and easy to use, so they are more suitable for astronomical popularization. ,     If you are a beginner, we recommend: Telescopes for Adults Astron

 The first astronomical telescope was a triple telescope made by Galileo using the method of telescope making.  It was later improved to magnify the telescope 20 times at once. He was able to see the round face of Jupiter and  the craters of the moon. In 1610, he used a telescope with a magnification of 30 times to observe four moons of  Jupiter and see the circle of Venus. Because Galileo improved the performance of the telescope, and used it to observe the stars,  the moon, Venus, and the sun, and published the first observations, it is precisely he who invented the astronomical telescope.   Suggestions for buying: Telescopes for Adults Astronomy    The astronomical telescope is an important tool for observing celestial bodies. It is composed of a main mirror,  a warp and weft platform and a hand controller. Can greatly facilitate the search and recognition of celestial objects.  The telescope's ability to collect light increases with its aperture, and the more powerful the teles