[fella]

If the Hubble were turned to look at Earth could it focus on us?

[shibumi]

I sincerely appreciate your faith in my assumed encyclopaedic mastery of trivia, but I must confess I have no idea.

But if you want me to guess.....

I suppose that it would be like using long range binoculars to look at something visible to the naked eye lying at your feet. In other words the optics would be ill suited to the task.

But in as much as I’m a Liberal Arts Snowflake with a degree in GPLS I could be completely wrong. But instinct tells me that something designed for the widest, deepest field of vision possible would be ill suited for locating gnats living on a local rock.

[Delta 21]

The Hubble can just barely focus on the moon. The earth is too close and moving too fast. Relatively speaking.

[minnesota_bound]

#10 They are called spy satellites. Same size mirror but longer focal length for zoom in more.