About Dennis Mammana

Dennis Mammana

Dennis Mammana

For more than three decades, Dennis Mammana has shared the wonder and mystery of the cosmos with audiences around the world. With a B.A. in physics from Otterbein College and an M.S. in astronomy from Vanderbilt University, Mammana has held positions at the Smithsonian's National Air & Space Museum, the University of Arizona, and San Diego's Reuben H. Fleet Science Center. He now works as an astronomy writer, lecturer and photographer from under the clear dark skies of Southern California's Anza-Borrego Desert. Mammana is the author of six books on astronomy, hundreds of popular magazine and encyclopedia articles and, since 1992, has written "Stargazers," the only nationally syndicated weekly newspaper column on astronomy.

As an accomplished night-sky photographer, his stunning images have appeared in a variety of media and international exhibitions, and can be enjoyed at his website, www.dennismammana.com. He is an invited member of TWAN — The World At Night — an international team of the world's most highly acclaimed sky photographers.

A dynamic public speaker, Mammana has entertained and informed audiences on six continents at resorts, on cruise ships and as an after-dinner speaker, and leads public tours to view and photograph such celestial displays as the aurora borealis and total solar eclipses. He makes frequent appearances on both radio and television.

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Celestial Guests Join the Winter Hexagon Nov 25, 2025

Week of November 30 - December 6, 2025 The brilliant moon illuminates our night sky again this week, reaching its full phase on Thursday, Dec. 4. All that extra light in the sky means that stargazers will see only the brightest of celestial objects o... Read More

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A Colorful Celestial Showpiece Nov 18, 2025

Week of November 23-29, 2025 Many stargazers are surprised to learn that stars do not all appear the same but actually display different colors. Those that appear white are hotter than those that are orange or red. And bluish stars are the hottest of... Read More

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Finding the Seventh Planet Nov 11, 2025

Week of November 16-22, 2025 Nearly two and a half centuries ago, in December of 1781, musical composer and amateur astronomer William Herschel was scanning his telescope through the skies over England when he came upon a tiny bluish-green dot that d... Read More

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Mr. Earth's Wild Ride Nov 04, 2025

Week of November 9-15, 2025 If you're seated while reading these words — as I am writing them — you're most likely convinced that you and the room around you are stationary. What if I were to tell you, however, that this just is not true?... Read More