... Because the DMR instrument is differential and every pixel is multiply sampled, sky maps are produced by solving a coupled system of linear equations (the normal equations) to minimize a chi-squared. ... This is reflected in the algebraic form of the normal equations matrix, so that, if one were to diagonalize the matrix, one would find a single eigenvector whose eigenvalue was identically zero, and the associated eigenvector, viewed as a sky map, would have a constant value. ...

... Astronomy Education Bibliography . ... These include planetaria, science museums, observatory visitor centers, NASA facilities, youth groups, and many similar organizations. ... NASA has extensive efforts to help in science education, on many fronts, but the agency is so large, and has so many centers and divisions that the education situation is complicated. ... NASA's Education Division produces a lot of educational materials, mostly about space flight, but some about astronomy and space science. ...

... Bad Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... My initial page about Star Wars had a couple of bad errors in it, errors which I should have known better than to make. ... A brief introduction: I'll state here I like the Star Wars movies (except Return of the Jedi, yikes!) and I liked the Phantom Menace (hereafter: tPM ). There wasn't a whole lot of astronomy in it, actually, so there isn't much to review. ... Bad: . ... Looking for Star Wars links? ...