What’s Up in Denver? October 12th through 18th, 2026

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Here’s a brief look at what’s going on in the Mile High City this week.

October 12: Catch the waxing crescent Hunter’s Moon near Venus and Mercury in the constellation Libra in the western sky just as the sun is setting around 6:15 PM Mercury reaches its greatest eastern elongation, appearing farthest east of the Sun from our vantage point on Earth.4:00 AM October 13: Cosmic Collisions: How Black Hole Mergers Shape the Hearts of Galaxies with Dr.… Continue reading.

What’s Up in Denver? September 28th through October 4th, 2026

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Here’s a brief look at what’s going on in the Mile High City this week.

September 28: DAS E-Board Meeting: Virtual meeting via Zoom (find details on Slack or Membership email): 7:00 PM September 29: Northern Colorado Astronomical Society: Poudre Learning Center Stargazing: Free, in-person event at Greeley High School: 7:15 PM September 30: 60 Minutes in Space with Dr.… Continue reading.

Observing Wolf-Rayet Stars in the Constellation Cygnus

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by John H. Bickel, Ph.D. Denver Astronomical Society, Member

What is a Wolf-Rayet star?

In 1867, French astronomers Charles Wolf and Georges Rayet using the 40 cm Foucault telescope, at the Paris Observatory [Ref. 1], discovered three stars in the constellation Cygnus (now designated HD191765, HD192103 and HD192641) that displayed broad emission bands instead of the typical absorption lines seen in most stellar spectra.… Continue reading.

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