Can you observe the moon from Capricorn?

Understand what the landlord wants to ask, first say a digression.

In fact, the landlord asked this question with a common sense mistake. From Capricorn, pay attention not to whether you can set foot on the stars, but to say that this question will make the questioner's understanding of the concept of constellation not very clear.

Constellation refers to an area in the sky, which refers to the area on the earth where we see a certain direction and divide it into a certain constellation. There are many stars, clusters, nebulae, galaxies and so on. In this constellation. In fact, they are not necessarily physically related, but we seem to be together from the perspective of the earth. Actually, the distance is very different.

For example, the well-known Big Dipper, in fact, their distances are different: the distance from Shu Tian is 124 light years; Tian Xuan is 79.4 light years away; Vernon's distance is 83.7 light years; The distance between celestial bodies is 8 1.4 light years; Yuheng distance is 80.9 light years; Kaiyang is 78.2 light years away; The shaking distance is 10 1 light-year.

In fact, there is no concept of constellation in this big space of the universe. What we usually call constellations only exist on the earth.

Therefore, the landlord said that the direction of "from Capricorn" is unclear. If there happens to be an artificial satellite passing through the sky area of Capricorn and you are on that satellite, can we say that you are in Capricorn? It is certainly possible to see the moon there.

Similarly, Capricorn may be a star in Capricorn, such as arcturus, or a galaxy in this direction.

Ok, digression, the landlord may just want to ask if we can observe the moon so far away from the star.

However, I think it is almost impossible to find the moon. The landlord can do a simple calculation. Even if the nearest star is 4.2 light years away, the angular diameter of the moon has reached the order of 10. So suppose it is 36 light years above the arcturus in Capricorn, which is the order of 10. The resolution of this optical observation instrument is basically unattainable, and the moon.

This is actually the process of finding extrasolar planets on earth. In fact, there are photos of extrasolar planets directly, but they are relatively close and large. It is almost impossible to directly observe the small moon with the earth beside it.