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The Hubble Telescope's Field of View

Size of the Moon Illusion
The Angular Size of the Moon
HST Field of View
WFPC Moon Mosaic
Copernicus Detail

Thumb with pea, held below moon.

The Moon is half a degree (30 minutes) wide. A pea balanced on the tip of your thumb, held at arm's length, just covers the disk of the Moon.


Sources:
STScI-PR99-14 April 16, 1999 Hubble Shoots the Moon
STScI - Advanced Camera for Surveys
Michael Gallagher
1999 and 2003
wfpc2 image