Sky & Telescope December 2025 Magazine

Cruise the Eridanus Constellation, Care for Your Cat, and Tour Three New Chilean Observatories

In the December 2025 issue of Sky & Telescope, we cruise down Eridanus, the Celestial River. Come tour its deep-sky sites with us and our cats. Schmidt-Cassegrains require special care, so use our guide to keep your telescope operating at peak performance. Thankfully, it’s a lot easier to maintain your SCT than it was to repair Hubble after it launched, but it’s thanks to those repairs that that mighty telescope was able to capture the first deep-field image and change astronomy forever. Join us in learning about the events that led to the capture of this historic image. Plus, we have eyes on three more up-and-coming observatories that are getting ready for their night in the starlight, high atop Chile’s desert mountains. Join Contributing Editor Govert Schilling as he gets up close and personal with these enormous scopes.