Mira, the Wonderful

as Mira, the Wonderful. Today we know Mira as the most famous of all long-period variable stars. It can begin its cycle about as bright as the North Star, fade by more than 600 times and then brighten again -- all over a period of 332 days. It is now near its maximum brightness and outshines all but one or two stars in this celestial region.

Perhaps even more interesting is that not only does Mira’s brightness vary over time, but so does its size. Though we cannot see this with the naked eye or even a telescope, astronomers have calculated that its orb swells and contracts by about 20%. At its largest and brightest, the star is more than 300 times larger than the sun. This means that, if it replaced the sun in our solar system, its glowing atmosphere would swallow the orbits of Mercury, Venus, Earth and Mars and would extend part of the way to Jupiter. (Coincidentally, Jupiter now lies to the upper left of this star.)

If that isn’t amazing enough, astronomers have found that Mira has a strange comet-like tail about 13 light-years long. They suspect it may be formed from material ejected by the star during the past 300 centuries.

In a dark sky right now, you should be able to spot this wonderful star near its brightest just before dawn. In the east-southeastern sky lies the constellation Cetus, the sea monster or whale. Cetus is said to be the beast that Poseidon sent to plague Cepheus when Cassiopeia claimed to rival the Nereids in beauty. It was said to be placed in the heavens to commemorate his heroic deed.

With some imagination, one might almost be able to trace among the stars the whale’s immense body, with its