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Moon or Planet? The Awkward Case of CD-35 2722B
https://www.centauri-dreams.org/2026/07/23/moon-or-planet-the-awkward-case-of-cd-35-2722b/
Published: July 23, 2026 17:15
Problems of definition will long be with us as we take ever closer looks at exoplanets. But they’re suddenly on everyone’s mind because of the detection of what some are calling an ‘exomoon’ in the system CD-35 2722, found in the constellation Columba. The…
New Propulsion Systems for Deep Space Smallsats
https://www.centauri-dreams.org/2026/07/17/new-propulsion-systems-for-deep-space-smallsats/
Published: July 17, 2026 12:24
Building the infrastructure we will need for interstellar exploration requires an imaginative look at today’s technologies as applied to distant targets. Indeed, we can leverage the scientific interest in, say, an orbit around each of the ice giants to…
What the Comments Taught Me: A Reply on Self-Replicating Probes
Published: July 13, 2026 20:07
Self-replicating probes continue to be a controversial subject, just as they were when Frank Tipler up the ante on Michael Hart by invoking them as a way of further tightening the tension of the Fermi Paradox. After all, Tipler had discovered an economic…
A Metallurgist’s Doubts About Self-Replicating Probes
https://www.centauri-dreams.org/2026/07/10/a-metallurgists-doubts-about-self-replicating-probes/
Published: July 10, 2026 12:43
Frank Tipler jolted the astrophysics community in 1980 when he introduced self-replicating interstellar probes into discussion of the Fermi Paradox. The mathematical model of self-replication came from John von Neumann, and was codified in 1966 (after von…
New Horizons: Pushing Toward the ‘Termination Shock’
https://www.centauri-dreams.org/2026/07/03/new-horizons-pushing-toward-the-termination-shock/
Published: July 3, 2026 12:15
Mission planning for any future star probe will adjust not only for conditions in the interstellar medium but also the Solar System’s outer reaches. Let’s confine ourselves for now to conditions in the outer heliosphere. Currently we have precisely one…
The Intergalactic Fermi Problem
https://www.centauri-dreams.org/2026/06/24/the-intergalactic-fermi-problem/
Published: June 24, 2026 17:48
The headwaters of the Fermi Paradox channel directly through Michael Hart and Frank Tipler, and it’s a testament to the power of their arguments that this remains true today. It was Hart who in “An Explanation for the Absence of Extraterrestrials on Earth”…
HD 39474: A Brown Dwarf Shapes a Planetary System
https://www.centauri-dreams.org/2026/06/19/hd-39474-a-brown-dwarf-shapes-a-planetary-system/
Published: June 19, 2026 10:41
With well over 6,000 exoplanets now confirmed and a continuing flow of data containing new detections, it has been clear for some time that our own Solar System’s model is hardly a template. I enjoy dipping into the bewildering variety of new systems and…
The Physics of Interstellar Travel
https://www.centauri-dreams.org/2026/06/11/the-physics-of-interstellar-travel/
Published: June 11, 2026 16:13
Coryn Bailer-Jones’ The Physics of Interstellar Travel fills a need which has become apparent only in the last twenty years. Indeed, going back to the turn of the century, one would find the idea of traveling to another star discussed only in relatively…
Observations on ‘The Search for Technosignatures: A Review of Possibilities’
Published: June 5, 2026 18:42
I don’t usually post comments at the top of the site, but I’m making an exception here for a couple of reasons. The recent paper I reviewed by Clément Vidal and colleagues covering technosignatures and strategies for detection is a significant work, the…
Evolving Strategies in the Search for Extraterrestrial Civilizations
Published: May 30, 2026 11:46
Looking for extraterrestrial life in the form of biosignatures will involve peering into the constituents of a planetary atmosphere and identifying out of equilibrium gases that tell us something biological is going on. But here’s the problem, as…