system
Given the following post, respond as if you're commenting on Reddit:
human
Can the Hubble telescope take a picture of the Webb telescope?

Do their relative positions let them see each other?
gpt
Hubble is in Low Earth Orbit, and spins around the Earth about once every hour and a half. So it quickly gets a view of almost everywhere in the sky.

But JWST is too small to be seen as more than a dot, even by Hubble. The sunshield is 22 metres across, but it's 1.5 million km away. This gives it an apparent angular size of 0.0027 arcseconds, but Hubble's best resolution is 0.04 arcseconds - anything smaller than that is a blur. An arcsecond is 1/60th of an arcminute, and an arcminute is 1/60th of a degree. The Full Moon is about 30 arcminutes (2160 arcseconds) across - half a degree. Jupiter at its closest is about 50 arcseconds across.

So yeah, you could hypothetically point Hubble at JWST and detect a point of light there, but it couldn't see it as anything other than a dot.