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Chasing Down Mercury
Week of Nov. 2-8, 2014
Mercury is one of those planets we rarely see.
Unlike Venus, which can dominate our sky with its brilliance, or Jupiter, Mars or Saturn that can shine brightly all night long, Mercury appears for only a few weeks each year and, even then, requires quite a bit of effort to find it.
Its elusiveness is legendary; it's been said that the great 16th century Polish astronomer Nicolaus Copernicus — who overturned the long-held notion that the Earth occupied the center of our planetary family — had never actually seen this world with his own eyes.
I wouldn't be surprised since, from our terrestrial vantage point, Mercury always appears so close to the sun that it's often lost in its glare. This occurs because Mercury is the innermost world of our solar system, and whips around its orbit once every 88 Earth-days at a distance of only 36 million miles from the scorching face of the sun.
Only when it reaches a significant "elongation" from the sun can we hope to see it, and this occurs only at dusk or dawn. In fact, some of the ancients thought of Mercury as two different bodies. The Greeks, for example, called it Hermes, the messenger of the Gods, when it appeared in the waning light of dusk, and Apollo when it shone in the morning before sunrise.
If you've never had the pleasure of spotting this fascinating world, now might be a great time to try.
To find it, head outdoors about an hour or so before sunrise, and begin scanning low in the eastern sky with binoculars.
Keep watch from morning to morning as Mercury appears to brighten as well as approach the star Spica until Nov. 4, when the two will form a beautiful pair in the morning twilight. After that, the planet appears to separate from the distant star as it drifts closer toward the horizon.
You can try aiming a small telescope in its direction, but you may be disappointed by what you see. First off, this planet is rather small — barely the size of the continental United States. And secondly, its appearance near the horizon means that its light must pass through a tremendous amount of distorting atmosphere before reaching our eyes.
If you're fortunate enough to see a relatively steady image, you might notice that Mercury now displays a nearly "quarter" phase, not unlike the moon does from time to time.
Mercury is a tiny planet and quite different than any other in our solar system. Because it's much too small and close to the sun to sustain an atmosphere, the temperature on its daytime side soars to hundreds of degrees, and on its nighttime side plunge to hundreds of degrees below zero. And spacecraft photos of this dry, cratered world look remarkably like those of the moon.
If, like the great Copernicus, you've never watched the antics of Mercury, don't miss the show this week!
Visit Dennis Mammana at www.dennismammana.com. To read features by other Creators Syndicate writers and cartoonists, visit the Creators Syndicate website at www.creators.com.
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