Analyse @NASAHubble's tweets
@NASAHubble
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@naztronomy Hubble images are stacked exposures. The Hubble Xtreme Deep Field is 2,000 images stacked, taken by two cameras, over 50 days, using two million seconds of exposure time. Later deep fields add in even more color/wavelength bands: https://t.co/B2g0BYTCf8.