The 0.25-square-degree Subaru Deep Field
spans an area of the sky similar to that covered by the full moon.
Each point of light in the image is one of
approximately 150,000 galaxies, each of them consisting of tens of
billions of stars (except for the few bright spots that are nearby
All 150 supernovae are
highlighted on the image. Every triplet of frames zooms in on one
event, showing the galaxy before the explosion, with the supernova
in progress, and in a digital "difference image" that isolates the
light from the supernova.
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