Here are All of Hubble's Observations in One Picture Stunning graphic by CJHandmer , article by Nancy_A
“I ran a basic calculation and I think it’s around 0.8% of the entire sky has been exposed to the Hubble imaging system,” Handmer said via email, adding that the answer is not as simple as counting the dots in the image because the poles are actually quite stretched on this map.
But why such a small amount? There are a few reasons, Handmer explained. The spectrometer instruments aren’t necessarily forming an image, for example. Another reason is that Hubble’s field of view is really narrow compared to telescopes that are intended to perform all-sky surveys. But another big reason is that Hubble tends to view certain areas of the sky or certain astronomical objects repeatedly. Why? Because that’s what scientists want to see.
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