Astronomical telescopes can allow us to observe celestial bodies far away from this planet, such as other galaxies, galaxy clusters, and even nebulae in the universe. But for some celestial bodies on the planet we are on, there is some lack of respect. Why? Let's solve this mystery together.

Firstly, we need to know the principle of telescopes. From a physical perspective, telescopes can focus the light from distant objects onto a single point, allowing us to see them. That's why telescopes can allow us to observe objects very far away from Earth.

But when we want to observe celestial bodies on Earth, the situation is different. This is because celestial bodies on Earth do not reflect light (reflection of light refers to light bouncing back from a surface), but rather emit light. Light is emitted in all directions, so it is impossible to focus all light on a single point.

Secondly, the influence of the atmosphere is also a very important factor. The atmosphere is a major obstacle for telescopes. The atmosphere will distort the propagation path of light, making the image seen by the telescope blurry. That's why when observing stars with the naked eye, they seem to be shaking.

In addition, light pollution is also an important factor affecting telescope observation. Light pollution refers to outdoor lights used in urban lighting and rural nightlife, which will make the sky brighter at night. Therefore, this will make telescope observation more difficult, as the stars in the night sky may appear obscured.

Finally, the limiting factor for telescope observation is distance, as the sub light sources on Earth are too far away, making some relatively small celestial bodies visually insignificant and making observations relatively difficult.

In summary, although telescopes can allow us to observe distant celestial bodies, they also have some limitations. When we try to observe some small celestial bodies or other sub light sources on Earth, there are still some technical difficulties and obstacles. I hope that scientists can further deepen their research and grasp details in the future, and better utilize telescopes for astronomical observations.