Re:1800s Astronomical Drawings vs. NASA Images (2016)
by dredmorbius on Wednesday August 18, 2021 @11:40AM
(#28222803)
Where "long" may be measured in anything from hours to months.
The Hubble Ultra Deep Field image (a follow-up to the original 1995 Deep Field image of an "empty" region of sky), has a total exposure time of just under 1 million seconds (11 days), with single channel exposures of a minimum of about 1.5 days.
This somewhat exceeds the duration and light-collecting capabilities of a human observer.
The Hubble Ultra Deep Field image (a follow-up to the original 1995 Deep Field image of an "empty" region of sky), has a total exposure time of just under 1 million seconds (11 days), with single channel exposures of a minimum of about 1.5 days.
This somewhat exceeds the duration and light-collecting capabilities of a human observer.
https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field
Though granted, such prolonged exposures aren't necessary for the nearer observations (many within the solar system) included in the article here.