Oct 30 - Brightest Comet in the Night Sky

October 30 Brightest Comet in the Night Sky by:

Martin Mobberley caught comet 46P/Wirtanen on October 27, from Siding Spring Observatory in Australia. The image shows the comet surrounded by a large coma, or cloud, visible when comets come near the sun. Image via Comets and Asteroids on Facebook. Good morning!   Brightest comet in the night sky     Comet 46P/Wirtanen isn't bright in an absolute sense. You'd need a telescope to see it now. But it's getting brighter and might reach visibility to the eye alone before the end of 2018. According to astronomers, Wirtanen will be the 10th closest comet in modern times. Read more. Ancient cold front in Perseus    Galactic cold fronts aren't like the cold fronts we experience on Earth. They're caused by galaxy clusters colliding into one another. Read more. How 600,000 pounds of dead salmon nourished Alaskan trees For 20 years, researchers counting dead salmon tossed them on the side of a shallow creek. The result, it turns out, was healthier, faster-growing trees. You'll enjoy this video. Watch.

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Tonight … Halloween ghost of the summer sun At mid-northern latitudes, Arcturus sets about 2 hours after sunset around Halloween, at the same point on the horizon as the summer sun. It's a Halloween ghost of the summer sun and an echo of long summer afternoons. Read more.

Sun halo over Zimbabwe Scientists call them 22-degree halos, because their radius is approximately 22 degrees from the sun. Ryan Vanderlinde of Zambezi Boy Photography in Zimbabwe caught this one this month. Read more about African and North American lore about sun halos. Submit your photo to EarthSky here! Did a friend forward EarthSkyNews to you? Click here to get your own subscription!

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