system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:If The Hubble Telescope's optics can focus on distant galaxies, AND can focus on a local body like Jupiter, why can't it see Pluto clearly?
gpt
The Andromeda Galaxy takes up ~1.58° in the sky. Jupiter takes up ~15.24 arcseconds (1/3600 of a degree). Pluto takes up ~0.05 arcseconds. Jupiter appears ~300 times larger in the sky than Pluto and the Andromeda Galaxy appears ~400 times larger than Jupiter. That's why the Hubble can't see Pluto.

Also, the Andromeda emits a lot of light. Jupiter reflects a large amount of light while Pluto reflects almost nothing.