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Posts: 10
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The Rest is Silence: Empirically Equivalent Hypotheses about the Universe
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Published: December 1, 2025 19:52
Because we so often talk about finding an Earth 2.0, I’m reminded that the discipline of astrobiology all too easily falls prey to an earthly assumption: Intelligent beings elsewhere must take forms compatible with our planet. Thus the recent post on SETI…
The Firefly and the Pulsar
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Published: November 20, 2025 15:27
We’ve now had humans in space for 25 continuous years, a feat that made the news last week and one that must have caused a few toasts to be made aboard the International Space Station. This is a marker of sorts, and we’ll have to see how long it will…
A Reversal of Cosmic Expansion?
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Published: November 12, 2025 18:33
We all relate to the awe that views of distant galaxies inspire. It’s first of all the sheer size of things that leaves us speechless, the vast numbers of stars involved, the fact that galaxies themselves exist in their hundreds of billions. But there is…
Building an Interstellar Philosophy
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Published: November 5, 2025 14:36
As the AI surge continues, it’s natural to speculate on the broader effects of machine intelligence on deep space missions. Will interstellar flight ever involve human crews? The question is reasonable given the difficulties in propulsion and, just as…
Jupiter’s Impact on the Habitable Zone
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Published: October 29, 2025 18:34
I’ve been thinking about how useful objects in our own Solar System are when we compare them to other stellar systems. Our situation has its idiosyncrasies and certainly does not represent a standard way for planetary systems to form. But we can learn a…
Interstellar Mission to a Black Hole
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Published: October 23, 2025 14:10
We normally think of interstellar flight in terms of reaching a single target. The usual destination is one of the Alpha Centauri stars, and because we know of a terrestrial-mass planet there, Proxima Centauri emerges as the best candidate. I don’t recall…
Teegarden’s Star b: A Habitable Red Dwarf Planet?
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Published: October 18, 2025 14:34
I have a number of things to say about Teegarden’s Star and its three interesting planets, but I want to start with the discovery of the star itself. Here we have a case of a star just 0.08 percent as massive as the Sun, an object which is all but in brown…
A Dark Object or ‘Dark Matter’?
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Published: October 14, 2025 17:29
We are fortunate enough to be living in the greatest era of discovery in the history of our species. Astronomical observations through ever more sensitive instruments are deepening our view of the cosmos, and just as satisfyingly, forcing questions about…
Solar Sails for Space Weather
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Published: October 9, 2025 13:34
A new paper dealing with solar phenomena catches my eye this morning. Based on work performed at the University of Michigan, it applies computer modeling to delve into what we can call ‘structures’ in the solar wind, which basically means large-scale…
Rogue Planets: A Stellar Infancy?
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Published: October 2, 2025 14:03
How exoplanets emerge from circumstellar disks has always intrigued me, and many open questions remain, including the precise mechanisms behind the fast growth of gas giants. When the topic swings to so-called ‘rogue’ planets, formation issues seem to be…