This movie shows the brightest EUV source in the sky, Epsilon Canis Majoris, a
seen over a 5-day period with one of the EUVE scanning telescopes.  The dark
"cross" in the image is the shadow of the filter bars on the detector.  The
upper half of the detector is the tin filter (centered at 555 A) and the lower
half is the aluminum/titanium/antimony filter (centered at 405 A).

(Courtesy Dr. Patrick Jelinsky)