Sky & Telescope October 2025 Magazine

Solar Prominences, Planetariums, and Martian Rivers

In the October 2025 issue of Sky & Telescope, we’re catching some Sun and solar prominences with our guide to imaging these stunning outbursts. Next, we head inside Hayden Planetarium for some shade and discuss the history of planetariums. Then, it’s into the dark to track down obscure planetary nebulae. We head back to well-trodden ground with Mars. Did you know that ancient rivers carved many of the features that rovers see on the Red Planet today? Finally, we bring it back home to our own pale blue dot, covering Christiaan Huygens efforts to reckon with our place in the universe back in 1698 with his masterwork, Cosmotheoros.