| http://www.w3.org/ns/prov#value | - And we subtract these images that we take each night from images that we have taken weeks, months, or even years before, and we look for things that go bump.It???s a very difficult process involving a lot of computers to subtract the data and then also tell us which ones are the most interesting types of transient astrophysical objects to look at.JEFFREY BROWN: Now, I gather another thing that mak
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