Rare ‘Zodiacal Light’ will be visible in night sky soon

March 8, 2012SPACEThe solar system’s small bodies have been often in the news lately. There are currently two bright comets in the southern sky, one of which, Comet C/2011 L4 (PANSTARRS) will soon be moving into the northern sky. An asteroid named 2012 DA14 recently passed close to the Earth. There have been two bright meteors in the past month, one in Russia and one in California. But these types of bodies aren’t the smallest relics of the solar system visible from here on Earth. A rare and hard to spot phenomenon called the Zodiacal Light, made from tiny solar system dust particles, can only be sighted under the best conditions. And a good time to view it is coming up soon. Most stargazers are unaware that they can actually see this interplanetary dust, when conditions are right. In some ways this disk of interplanetary dust is similar in appearance to the Milky Way. The glow of the Milky Way is the result of the combined light of millions of stars too faint to be resolved by the unaided eye. The interplanetary dust disk, called the Zodiacal Light, is the result of millions of dust particles too faint to be resolved. Unlike the Milky Way, which can be resolved with a telescope, the particles that make up the Zodiacal Light are too small to be resolved by any optical instrument. There are only a few windows of opportunity during the year to see the Zodiacal Light, and one of these is coming up over the next couple of weeks. One factor is that the moon will move out of the evening sky, leaving it darker and making fainter objects more easy to spot. A second factor is that the ecliptic, where the Zodiacal Light is brightest, will be perpendicular to the horizon in the early evening in the northern hemisphere. Wait until the sky is completely free of scattered light from the sun, at least an hour and a half after sunset. First of all, choose an observing location with a very dark sky. It must be dark enough that the Milky Way is easily visible, because the Zodiacal Light is fainter than the Milky Way. At this time of year in the northern hemisphere, the Milky Way is setting in the northwest in the early evening, marked by Cassiopeia and Cygnus. The ecliptic, marked with a green line in the chart, is due west, passing through the faint constellation of Pisces. In a dark sky, you will see the Zodiacal Light and the Milky Way as two distinct but very faint objects. The Milky Way gets wider and brighter higher in the sky, while the Zodiacal Light gets narrower and fainter. The first is a band, the second a cone. If you succeed in spotting the Zodiacal Light over the next few weeks, you will have observed one of the rarest phenomena in the night sky. –MNN
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3 Responses to Rare ‘Zodiacal Light’ will be visible in night sky soon

  1. the worst thing about living in western cities is with the street lights stop us from seeing the stars

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  2. Mary says:

    I remember seeing the Milky Way when my dad would allow my brothers and I to ride in a cotton trailer full of cotton at night on the way to the gin. What an incredible experience, it still brings awe to me when I think about that time, and how God is kind and gracious to create such wonderful sights.

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