M41 is an open star cluster in Canis Major. It may have been discovered by Aristotle as early as 325 BC

Aristotle on Astronomy: Supporters and Challengers

July 18, 2019

Centuries after Aristotle’s death, his theories on astronomy were met with some surprising endorsements from the Christian church, most notably Thomas Aquinas. Discover how both Plato and Aristotle’s theories were used to support theological doctrine. Later on the historical timeline, though, both Copernicus and Galileo challenged Aristotle’s views on planetary bodies. […]

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The Great Courses Learning Paths—Astronomy and Space

May 31, 2018

With propulsive advances in science in recent decades, we’re learning more than we ever imagined possible about what the universe is—and how it works. Embark on fascinating, richly-illustrated adventures that take you to all corners of the cosmos through this series of courses designed to make the universe accessible, understandable, and awe-inspiring. […]


Stonehenge: A Remarkable Relic of Archeoastronomy

February 9, 2017

Ancient astronomers achieved remarkable feats that were built on many thousands of years of watching the sky. How did they accomplish so much without using the technology we have available today? Welcome to the study of archeoastronomy. […]

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The Remarkable Science of Ancient Astronomy

February 6, 2017

Part science, part history, part archaeology, part cultural anthropology, and part detective story, the study of Ancient Astronomy depends on an astute reading of clues to unravel the complex relationship of ancient people with the sky. […]

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Learn about Space Travel as Space Force Releases Recruitment Video

May 15, 2020

The United States Space Force has released a recruitment video on Twitter. The 11th Combatant Command in the Department of Defense featured a 30-second clip to garner interest from individuals who may wish to enlist. Yet, we have not learned how to pursue interstellar space travel. […]

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Coronavirus News

Reopening Society Requires Minimizing Risk, Uncertainty

April 21, 2020

Ending COVID-19 lockdown measures early or indelicately could be a big problem, NPR reported. Many measures must be taken to prevent extensive loss of life before we reopen the country. Facing uncertainty wisely means minimizing risk. […]

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