September 15, 2023

Guided Stargazing Tours: Dennis Mammana

Chasing Skies and Dreams Dennis Mammana's passion couldn't be contained within Earth's atmosphere. A seasoned night sky photographer, his lens has captured the ethereal dance of the aurora borealis in Arctic landscapes more than 30 times. And when it comes to total solar eclipses, he's witnessed and photographed an astounding 18 of them – an experience that continues to inspire and mesmerize.

Borrego Springs: Celestial Wonders

In the enchanting world of Borrego Springs, a mere two-hour drive from downtown San Diego, stargazing reaches new heights under the expert guidance of acclaimed astronomer Dennis Mammana. This desert refuge, famed for its optimal stargazing conditions, is cradled by the vastness of Anza-Borrego Desert State Park and protected by encircling mountains, offering one of Southern California’s most profound night skies.

As California’s inaugural International Dark Sky Community, Borrego Springs has earned acclaim from KCET, USA Today, and Afar Magazine, cementing its status as a leading stargazing destination. With an array of enthralling stargazing events and a celestial tapestry awaiting exploration, Borrego Springs stands as a luminous oasis, echoing the very spirit that beckons Dennis to its starry night.

Guiding You Through The Stars

Enter the world of Dennis Mammana – a name synonymous with the magic of the night sky, an avid astronomy author, syndicated columnist, captivating public speaker, and a true guardian of Borrego’s starry nights.

Dennis Mammana: A Cosmic Journey

Dennis Mammana’s cosmic journey began in Easton, PA, where the merging rivers seemed to echo his connection to the universe. The launches of Earth-orbiting satellites in the late 1950s ignited his fascination with the celestial realms. Armed with a degree in physics and astronomy from Otterbein College (now Otterbein University), he embarked on a journey destined to illuminate the skies for generations.

In 1973, Dennis ventured to Vanderbilt University, conducting a year-long photometric study of distant Seyfert galaxies. This set the foundation for his lifelong pursuit of sharing cosmic narratives. With an M.S. in astronomy, he contributed to esteemed institutions like the Smithsonian Institution’s National Air & Space Museum, the University of Arizona, and San Diego’s Reuben H. Fleet Space Theatre & Science Center.

Dennis Mammana: Cosmic Illuminator

Dennis Mammana’s influence spans the globe through captivating planetarium programs that have enraptured audiences worldwide. Collaborating with luminaries like Burgess Meredith and Patrick Stewart, his directorial skills even extended to a partnership with science fiction icon Arthur C. Clarke. As an esteemed National Association of Science Writers member, he’s authored six popular astronomy books, including a pioneering work on extra-solar planetary systems.

From captivating images featured in international magazines to earning coveted membership in TWAN (The World at Night), Dennis’s night sky photography is a testament to his prowess. His dynamic speaking engagements at resorts, museums, and cruises have enlightened countless audiences. Leading public observing and sky photo tours across 50 countries, he’s chronicled the aurora borealis and documented 18 total solar eclipses. A recipient of esteemed awards,

Dennis’s influence even extends to shaping Borrego Springs as the first International Dark Sky Community , an honor celebrated during his role as Grand Marshal of the Borrego Days Desert Festival.

“We protect the desert, and now we’re protectors of the sky,” said Dennis Mammana , a local astronomer and photographer. “Borrego is not just a daytime place. We’re a celestial preserve.”
psmag.com

Stargazing Made Fun and Friendly

Dennis’ nationally syndicated newspaper column, affectionately known as “Stargazers,” catapults us into the universe’s heart. Dennis brings the cosmos to our doorstep with an almost magical touch through vivid descriptions and relatable narratives. The column’s headlines, like “Chicken Little Right: The August Sky Is Falling!” and “Big Moon A-Risin’,” infuse a playful twist into astronomical insights, making the universe understandable and truly enjoyable.

But there’s more to this cosmic storyteller than words on paper. Delving into the night sky, Dennis Mammana goes beyond the ordinary to provide detailed updates through his Facebook page. With a passion that knows no bounds, he leads us on celestial journeys through his posts, unraveling the mysteries of stars, planets, and beyond.

Whether it’s a rare alignment of planets or a meteor shower extravaganza, Dennis’s Facebook updates promise a front-row seat to the cosmic spectacle.

Borrego Night Sky Tours with Dennis Mammana

Join Dennis on a captivating journey through the cosmos with Borrego Night Sky Tours.

Under the pristine dark skies of Southern California’s Anza-Borrego Desert, many celestial wonders await – from colorful stars and stellar clusters to star-forming nebulae and distant galaxies. With the power of an 11-inch diameter Schmidt-Cassegrain reflector telescope, Dennis will unveil the universe’s secrets, transporting you back through time to witness ancient celestial objects. As you peer through this powerful instrument, the cosmos comes alive, revealing its beauty and mysteries. Borrego Springs, an International Dark Sky Community, provides the perfect backdrop for this celestial adventure, ensuring an unforgettable night of stargazing.

SCHEDULE YOUR CELESTIAL ADVENTURE

Beyond being a global astronomy enthusiast, Dennis is integral to Borrego Springs’ identity as an International Dark Sky Community.

Let Dennis Mammana, your seasoned celestial tour guide, illuminate the universe and create memories that will last a lifetime. Check out the tours!

So, is Dennis Mammana the star of Borrego Springs?

Without a doubt! His journey from cosmic curiosity to global astronomy authority mirrors the journey of Borrego Springs itself – a haven for those who seek to explore the universe above. To never miss an opportunity to learn, observe, and celebrate the night sky, make sure to subscribe to his StarTrails e-newsletter and follow him on Facebook. Let’s continue to traverse the cosmos with Borrego’s very own star.

Dennis Mammana Videos..ENJOY!

Meet Betelgeuse: A True Superstar

March 6, 2026

By Dennis Mammana Week of March 8-14, 2026 If you hear the word "superstar," what immediately comes to mind? Perhaps names like Tom Hanks, Taylor Swift or LeBron James? That's certainly understandable; they are all undisputed superstars who attract the attention of paparazzi and fans alike. If you're an astronomer, however, you may answer this question differently. For example, when I hear the word "superstar," I think of UY Scuti, WOH G64 or RSGC1-F01. Yes, these are superstars, but not quite how people may think. These are some of the largest stars known in our galaxy and, for that reason, are quite intriguing to us celestial paparazzi. Regular readers of this column know that our sun is also a star. It appears big and bright in our daytime sky because not only is it rather close (about 93 million miles away), it's also pretty large (nearly a million miles across). It sounds huge, but our star is rather small on a cosmic scale, and believe it or not, there are stars out there that would dwarf our sun and make it look tiny. These are the true superstars! Until recently, the largest star known was given the hopelessly poetic name of UY Scuti. At a distance of some 9,500 lightyears from Earth, UY Scuti is what is known as a red hypergiant star, with a diameter some 1,700 times that of the sun! All that changed recently, however, when astronomers found a gargantuan star some 2,150 times larger than our sun! It's named Stephenson 2-18, and if you'd like to get a peek at this stellar behemoth, you'll need more than your eyes. At a distance of some 18,900 lightyears, it appears 5,100 times fainter than we can see without a telescope. If you have no telescope but would still like to see a celestial superstar, you're in luck. There's one shining in our night sky right now; it's one of the brightest up there and is named Betelgeuse. Betelgeuse sparkles brightly in the northeastern corner of Orion, the hunter, and you can see its orange light midway up in the southern sky after dark this week. With about 15-20 times more mass than our sun, Betelgeuse is known as a red supergiant star for good reason. While we could align 109 Earths across the face of our sun, we would need at least 700 suns to cross the face of Betelgeuse! Indeed, this star is so immense that if it replaced our sun at the center of our planetary system, Betelgeuse would engulf the orbits of Mercury, Venus, Earth and Mars, and stretch part of the way to Jupiter! Yet it appears as a simple point of light in our night sky because of its tremendous distance from us — some 3,100 trillion miles, or about 520 lightyears. Betelgeuse is easily one of the largest known stars, though its size fluctuates by as much as 60% as the star shudders and pulsates on its way to an eventual supernova explosion, thousands or millions of years from now. Or tonight. We just don't know. I hope you'll step out under the night sky soon to meet this remarkable superstar for yourself! Visit Dennis Mammana at dennismammana.com. To read features by other Creators Syndicate writers and cartoonists, visit the Creators Syndicate website at www.creators.com. Learn More About Borrego Springs

Shadow on the Moon

February 25, 2026

By Dennis Mammana Week of March 1-7, 2026 Attention, night owls and insomniacs! The sky show this week is just for you! Much of North America is about to see the moon experience one of nature's most beautiful sky shows: a total lunar eclipse. A lunar eclipse occurs when the full moon slips into the Earth's shadow far out in space, either partially or completely, and that's just what will happen during the wee hours of March 3. Skywatchers throughout North America will see the start of this eclipse (weather permitting, of course), but depending on where you live, you may see only a portion of the sky show. In general, the farther west you live, the more of the eclipse you will see before the moon sets behind the western horizon. The eclipse begins at 12:44 a.m. PST (3:44 a.m. EST), when the moon enters the Earth's light outer shadow (known as the penumbra), but this shadow is so thin that no one will notice a darkening of the moon's appearance. Within an hour or so, that will change significantly. As the moon approaches the dark inner shadow of the Earth (known as the umbra), skywatchers will notice the eastern side of the moon beginning to darken slightly. The real show begins at 1:50 a.m. PST (4:50 a.m. EST) when the moon officially enters the umbra. No one gazing skyward will have any doubt that a "bite" has been taken out of the moon — a bite that will grow larger with each passing minute. For the next hour or so, the moon will dim as it slips more deeply into our planet's umbra, until 3:04 a.m. PST (6:04 a.m. EST) when it's completely engulfed and the total eclipse begins. Unfortunately, those in the far eastern part of North America may miss this since the moon will lie quite close to (or even below) the western horizon. During the total phase, the moon will take on a dim coppery hue. This occurs because sunlight passing through our atmosphere is reddened and bent inward toward the darkened surface of the eclipsed moon, now suspended eerily against the stars of Leo, the lion. Only those viewing from the Midwest to the West Coast will see mid-eclipse, which occurs at 3:33 a.m. PST (5:33 a.m. CST). Those in the Midwest may miss the end of totality at 4:02 a.m. PST (6:02 a.m. CST), however, as the moon will be setting in the west. The entire event will end at 5:17 a.m. PST (4:17 a.m. MST) with the moon approaching the western horizon for viewers in western North America. Unlike an eclipse of the sun, a lunar eclipse is perfectly safe to view without protective filters. Your eyes are all you need to enjoy the show, but you'll have even more fun viewing through binoculars or a small telescope. If the sky is cloudy that morning, or if you live where the eclipse won't be visible, you can watch a livestream of the sky show online. Visit timeanddate.com and click on "Sun, Moon & Space" at the top to find details for your location, as well as links to view the eclipse live online. Visit Dennis Mammana at dennismammana.com. To read features by other Creators Syndicate writers and cartoonists, visit the Creators Syndicate website at www.creators.com. Learn More About Borrego Springs

Dennis Mammana: Search for a Planetary Island Within the Celestial River

By Dennis Mammana • February 11, 2026

Among Eridanus’ prominent stars is Epsilon Eridani. Creators.com illustration

A Stellar Nursery Tale By Dennis Mammana

By Dennis Mammana • January 22, 2026

The Great Orion Nebula is visible with the unaided eye.

Top Stargazing Spots in Borrego Springs

By Jake Hinton • September 15, 2024

Explore the best stargazing spots in Borrego Springs, California, with a stargazing map by the Dark Sky Coalition. Discover popular locations and tips for a perfect night under the stars.

(Q&A) Dennis Mammana: Astronomy and Dark Skies

By Jake Hinton • September 12, 2024

Meet Dennis Mammana, a passionate astronomer with nearly five decades of experience in unraveling the mysteries of the cosmos. Dennis’s journey began in Easton, PA, where he was captivated by the launch of the first Earth-orbiting satellites in the late 1950s.

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