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Dean Regas

About Dean

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Dean Regas in front of Cincinnati Observatory

Your Astronomer

Featured in the New York Times and Washington Post

Dean has been the Astronomer for the Cincinnati Observatory since 2000. He is a renowned educator, author, national popularizer of astronomy and an expert in observational astronomy.

From 2010-2019 Dean was the co-host of the PBS program Star Gazers. He is the author of six books including "Facts From Space!" and "100 Things to See in the Night Sky". Dean is a Contributing Editor to Sky and Telescope Magazine and a contributor to Astronomy Magazine, where he won 2008 “Out-of-this-World” Award for astronomy education.  Dean has written over 160 astronomy articles for the Cincinnati Enquirer, blogged for the Huffington Post and is regularly featured on television and radio.  Dean is a frequent guest on National Public Radio’s Science Friday with Ira Flatow and NPR's Here & Now. He also hosts an astronomy podcast with Anna Hehman called "Looking Up!"

At the Cincinnati Observatory, he has developed his skills as a dynamic writer and public speaker who brings the complicated field of astronomy down to Earth for students of all ages.

1000 Facts About Space

Dean's new book with National Geographic

Dean takes you on an incredible tour of facts about each planet in our solar system, dwarf planets, our sun and other stars, 

Did you know … that one of Saturn’s moons is so hollow it would float in water? That the largest known star is 3.69 billion times bigger than our sun? Or that Jupiter likely has diamonds floating in its clouds?

Explore dazzling facts about the vast expanse of space, from glowing stars billions of light-years away to supermassive exploding supernovas to rockets thundering into the unknown. This comprehensive book takes you on a mind-blowing tour of our unbelievable universe and is full of fascinating facts on topics such as space exploration, our solar system and galaxy, and beyond.

Expert astronomer Dean Regas—former host of PBS’s Star Gazers and astronomer of the Cincinnati Observatory—takes you on an incredible tour of facts about each planet in our solar system, dwarf planets, our sun and other stars, exoplanets, comets, asteroids, galaxies, space travel, and so much more. Hundreds of stunning photographs bring the facts to life.

A universe of fun and discovery awaits!

Join Dean for a book talk and signing March 19, 2pm at the Observatory.

And get your copy wherever you get your books.


Book cover to How to Teach Grown-Ups About Pluto by Dean Regas

How To Teach Grown-Ups About Pluto

The Cutting Edge Space Science of the Solar System

New book for kids and adults

Pluto has not been a planet since 2006. But this tiny world still inspires people of all ages while sparking controversy. In this delightfully witty book, astronomer Dean Regas teaches you how to educate your grown-up about the cutting-edge science of space, most crucially the reason why Pluto is NOT a planet anymore.

Delving into the history of space discoveries, the key players who have helped our understanding of the universe (including the 11-year-old girl who named Pluto in the first place), and the ever-changing nature of science, this book will equip every reader with the tools they need to bring their grown-ups fully up to speed, and to sneak in as many amazing astronomical facts as possible. 

And there’s a handy quiz at the end so that you can check your grown-up has been paying attention!

Available at the Cincinnati Observatory and wherever you get your books

More info on How to Teach Grown-Ups About Pluto

Buy the book On Amazon or On Barnes and Noble

Book cover for "100 Things to See in the Night Sky"

100 Things to See in the Night Sky

Expanded Edition

"This book points to an unexpected source of entertainment, and even solace, in the skies above ... As the world roils, the stars spin on."  - Washington Post

Learn your way around the best, most fascinating objects you can find with the naked eye and binoculars in the updated and expanded collection of planets, stars, constellations, and more.  With more detailed star charts this book is perfect for beginners and amateur astronomers wanting to explore the night sky.  

Available on Amazon   And Barnes and Noble  and For Sale at the Observatory

Upcoming and Recent Appearances


Blue Licks Battlefield State Resort, The Spring Sky - April 1, 8:00pm

Cincinnati Museum Center, 100 Things to See in the Night Sky - April 22, 11:30am

Peoria Astronomical Society, Peoria, Illinois - April 28

Des Moines Astronomical Sociaety, Iowa - April 29

Grand Canyon National Park Star Party, Featured Speaker - June 12



Joseph Beth Booksellers, 1000 Facts About Space book signing - March 4 at 2pm

Mercantile Library, Stand-Up History - February 2

Detroit Observatory, Ann Arbor, Michigan -  January 24, 7pm

Cincinnati Symphony Orchestra, Preview Talk for the Planets - December 2

Joseph Beth Booksellers, Pluto book signing - November 12

Joshua Tree Night Sky Festival, 29 Palms, California - Keynote Speaker - September 24, 2022 More Info

Crater Lake National Park - Stargazing - August 21, 2022

Stellafane Amateur Astronomer Convention, Springfield, Vermont - Speaker - July 29, 2022 More Info

Thurber House Literary Picnic - Special Guest - June 30, 2022 More Info and Tickets

Bryce Canyon Star Festival - Keynote Speaker - June 25, 2022 More Info

Grand Canyon Star Party - Speaker - June 20-22, 2022  More Info

Lowell Observatory - Special Guest Speaker - June 19, 2022 In Flagstaff, AZ

Shenandoah National Park - Star Party - May 27, 2022

Detroit Observatory Reopening - April 8, 2022 In Ann Arbor, MI

Grand Canyon Astronomer in Residence -  More Info

Blue Licks Battlefield State Park, Carlisle, KY - October 22, 2021

Science Friday - Oct. 14, 2021 Interview with Dean about What's Up in the Sky

Wall Street Journal review of Dean's Book 100 Things to See in the Night Sky, Expanded Edition

Joshua Tree Night Sky Festival - Keynote speaker - 2021

Here & Now Interview- December 7, 2020  A Match Made in Heaven

The Tundra - Virtual Event "Beyond Space" Watch it Here

Here & Now radio program - June 29, 2020 - Listen Here and Now

Washington Post - 100 Things Book - June 20, 2020 - Read the Review

Dean in Cincinnati Magazine - May 15, 2020 - Check out the article

Science Friday - Dean Regas Explains the Lunar Eclipse  Listen Here

Here & Now Interview - Super Blood Wolf Moon - January 20, 2019  Here & Now Eclipse

Here & Now Interview - 2018 a Busy Year in Space - Dec 28, 2018  2018 in Review

Books by the Banks - Cincinnati Regional Book Festival - October 20, 2018

Science Friday live from WVXU Cincinnati - April 20, 2018 Science Friday Interview

Hawaii Volcanoes National Park, Hawaii - Star Party - January 29, 2018

Huffington Post - September 11, 2017  Cassini Mission to Saturn Article

New York Times - When the Universe Calls - September 8, 2017 New York Times

Bryce Canyon Star Party - Keynote Speaker - June 23, 2017 

NEAF, Northeast Astronomy Forum - Speaker - April 8, 2017  NEAF

USA Today - December 28, 2016  Highlights of 2017

Science Friday with Ira Flatow - December 23, 2016  Science Friday

Science Friday with Ira Flatow - May 6, 2016  Transit of Mercury

Huffington Post - September 24, 2015 Supermoon Lunar Eclipse

Science Friday - September 18, 2015  Keeping an Eye on our Celestial Companion

Science Friday - June 5, 2015  How I Explained the Sun

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