Crab Nebula

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Two pictures of the Crab Nebula: and the handout.

By careful examination of these two pictures from different years, we can determine the date of the supernova. This Excel spreadsheet will greatly help in carrying out the three step process: The cells shaded in blue are the ones where you'll enter data. The other cells contain formulas which will show sensible numbers when you have entered your data.
Steve Liebling (home)