Dennis Mammana
- Indexed articles, last 90 days
- 10
- Latest publication
- Sep 8, 2026
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- Jul 5, 2026
Latest articles
Dennis Mammana: Catch Venus While You Can Before It Vanishes From the Evening Sky (opens the original)
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This week we bid adieu to the brightest planet in the heavens: Venus. For the past few months, it has glistened like a jewel in our western sky at dusk, but now it’s appearing lower at dusk each night, soon to disappear from our evening sky. Don’t be too concerned, though; it’ll be back in the fall of 2027. In the meantime, you’ll be able to see it shining brilliantly in the predawn sky beginning sometime in November. Why Venus behaves like this is a question that bugged early skywatchers. In fa
Dennis Mammana: Forget the Mythology and Connect the Dots to Find Your Way Around the Night Sky (opens the original)
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Lions and tigers and bears, oh my! That’s what Dorothy and her friends were worried about in The Wizard of Oz, but you’ll find none of them in the night sky. Understandably, beginning stargazers quickly become frustrated because they cannot see in the sky the images they find portrayed on celestial maps. It’s always wise to keep in mind the words of my former boss: “The constellations look no more like their namesakes than the George Washington Bridge looks like the Father of our Country.” As yo
Dennis Mammana: August’s Full Moon Steps Into Earth’s Shadow for Dramatic Lunar Eclipse (opens the original)
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On the evening of Thursday, Aug. 27, the full moon will rise in the east as it does just about every month. It won’t take long, however, for it to begin looking a little strange. Regular readers of this column know that the full moon occurs when the moon lies on the opposite side of the sky from the sun. When this happens, it also finds itself near the shadow being cast into space by our planet. Just about every six months or so, the moon will drift into this shadow and produce a lunar eclipse.
Dennis Mammana: Pluto, the Little Planet That Couldn’t (opens the original)
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It was 20 years ago that our solar system lost a planet. Well, it didn’t really go anywhere, but Pluto is no longer a planet because it’s been reclassified. I’m sure you figured out in school that scientists love to classify things. Rocks, clouds, plants and, yes, even stars and planets. So why did they feel the need to reclassify Pluto? Because Pluto doesn’t seem to fit the pattern of the rest of the major worlds of our solar system. First, it’s a world not even 1,500 miles across; in other wor
Dennis Mammana: The Perseids Are Back — and This Year They’re Worth Staying Up For (opens the original)
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August has become one of my favorite months for several reasons. For one thing, the blistering heat of the Anza-Borrego Desert where I live is nearing an end. Thankfully! Another reason is that the Milky Way appears to arch beautifully overhead after dark. And finally, I get to watch one of the two best meteor showers of the year as it reaches its peak this month. I’m referring, of course, to the famous Perseid meteor shower. It’s been a couple of years since we’ve had a Perseid display without
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