Interesting paper on non-human species communication. Can we learn from signaling patterns in fireflies how to distinguish optical SETI signals in astronomical data? What about dolphin 'language' or bird-song? More on today's Centauri Dreams. www.centauri-dreams.org/2025/11/20/t...

Possible evidence that the accelerated expansion of the universe is being mis-read, based on new analysis of supernovae data. Is the cosmos in fact decelerating? Is the universe, after all, cyclical? www.centauri-dreams.org/2025/11/12/a...

Machine intelligence will guide our first interstellar missions. Putting non-biological 'crews' on journeys of this magnitude is inevitable, but it challenges us to revise our values and adjust our moral philosophy. Thoughts on why this is necessary. www.centauri-dreams.org/2025/11/05/b...

Will we ever study a black hole up close with a spacecraft? Some musings on how it might be done as we learn to locate solar-mass BHs within tens of light years. Interesting paper points out science opportunities. www.centauri-dreams.org/2025/10/23/i...

Teegarden's Star has a planet that might be habitable, but only if we make key assumptions. I look at recent work on what those assumptions are, and how much we still don't know about the 'habitability' question. www.centauri-dreams.org/2025/10/18/t...

On that dark 'object' that may help refine dark matter models in the early universe. If indeed it is dark matter and not an ancient inactive dwarf galaxy. Striking detection via gravitational lensing pushed to its limits. www.centauri-dreams.org/2025/10/14/a...

Something no other propulsion system can do: Non-Keplerian orbits, essentially hovering over a target. Space weather mission concept illustrates the possibilities. Will we be smart enough to fund it? www.centauri-dreams.org/2025/10/09/s...

Rogue planets move through interstellar space with no star to warm them. We've assumed they've been ejected from a parent star system, but now it appears some form in same way stars do. A fascinating example discussed in new paper. www.centauri-dreams.org/2025/10/02/r...

If the Wow! Signal was result of power beaming accidentally sweeping across our sky from another star system, why would it be so narrow in bandwidth? James Benford offers an explanation that shows how physics forces the issue. www.centauri-dreams.org/2025/09/22/b...

A new look at old data from Ohio's Big Ear, where the famous Wow! signal was recorded. Plus thoughts on a recent work that analyses the factors that make a technological civilization possible. How likely is it that we are alone? www.centauri-dreams.org/2025/09/15/s...

Life on Ceres? Almost certainly not now, but go back a few billion years ago and conditions in the asteroid's sub-surface ocean could have supported micro-organisms. New study makes us wonder about other outer system objects. www.centauri-dreams.org/2025/09/03/a...

Keith Cooper's new book Amazing Worlds looks at the interplay of science fiction and exoplanet research. It's a crisp, well-informed survey rich in SF both classic and new, mingling with latest exoplanet data. My review is available here. www.centauri-dreams.org/2025/08/29/a...

Deeply saddened to learn of the death of Italian physicist Claudio Maccone, a good friend and a leading figure in interstellar studies. I post some recollections about this fine man today on Centauri Dreams. www.centauri-dreams.org/2025/08/22/c...

Further thoughts on generation ships, including an obvious one. Will we insist on carrying humans to other stars, or are we more likely to send intelligent machines? www.centauri-dreams.org/2016/03/25/t...

Project Hyperion generation ship design contest produced a solid result in 'Chrysalis,' a richly detailed study of how a ship like this could be constructed. Key problems: As always, propulsion, & especially closed loop life support. That last one is huge. www.centauri-dreams.org/2025/08/12/c...

A Saturn mass gas giant may be orbiting Alpha Centauri A, based on solid JWST infrared results and exhaustive simulations of its orbit. It's still a candidate rather than a confirmed world, but follow-up work will tell us soon. www.centauri-dreams.org/2025/08/08/a...

David Kipping's Torqued Accelerator using Radiation from the Sun) concept gets a touch up by Alex Tolley, who asks whether there are ways to extract even more performance from a rotating system capable of exiting the Solar System. www.centauri-dreams.org/2025/08/05/a...

Fresh thinking on the interstellar conundrum. David Kipping's TARS offers fast transit in-system and interstellar options as well. Key benefit is flexibility, capability of swarm missions, and very low cost. www.centauri-dreams.org/2025/08/01/a...

SETI at the extremes. I look at science fictional treatments of life in high-energy environments like neutron stars. The SETI community is now beginning to consider possible technosignatures from places we've always ignored. www.centauri-dreams.org/2025/07/22/s...

A just released image from Gemini North shows interstellar object 3I/ATLAS, a cometary coma (gas & dust) still fairly compact but sure to grow larger as perihelion approaches in October. www.centauri-dreams.org/2025/07/16/a...

Interstellar navigation will need to be autonomous as we go farther & farther from Earth. New Horizons just demonstrated use of parallax by taking images of Proxima Cen & Wolf 359, & determining position from the result. Longest baseline ever used. www.centauri-dreams.org/2025/07/15/a...

3I/ATLAS is the third interstellar object we've identified. Almost surely a comet, it's moving toward perihelion in October, and is already active as its surface warms. We'll learn a great deal more about it as this process intensifies. Thoughts on ISO's: www.centauri-dreams.org/2025/07/10/3...

Defining habitability is a must if we are to prioritize targets for next generation telescopes. A quantitative approach appears in a recent paper, though it doesn't necessarily cover all the bases. Alex Tolley takes a look at these ideas in today's post. www.centauri-dreams.org/2025/07/07/n...

Using a direct fusion drive as being designed at Princeton for a Sedna orbiter. Interesting conceptual analysis & feasibility study, contrasting this option with a solar sail using desorption, blowing off embedded elements at perihelion. Hint: sail is faster. www.centauri-dreams.org/2025/07/01/a...

Looking at a Saturn class world in formation around the star TWA 7. This is a JWST catch & not yet confirmed, but evidence is strongly supportive of a planet here, the smallest yet found via direct imaging. www.centauri-dreams.org/2025/06/27/j...

John Coltrane's Sun Ship album inspires musings on interstellar flight as imagined by the ancients and now explored by aerospace engineers. Starflight inspires imaginative leaps even as current missions like the Parker probe push what we can do today. www.centauri-dreams.org/2025/06/25/i...

Propulsion via nuclear decay may be workable through new design from Jim Bickford, now entering Phase II at NASA NIAC. Delta-v up to 150 km/sec feasible in these calculations, in a maneuverable & very scalable design. Gravity lens possibilities. www.centauri-dreams.org/2025/06/20/t...

Inflatable sails offer steep savings in mass & enable larger payloads. I look today at deep space concepts involving this technology, & new studies on using inflatable structures for exoplanet research via a starshade. www.centauri-dreams.org/2025/06/11/i...

You wouldn't expect many gas giant planets around tiny red dwarf stars, & statistics bear this out. But the few that have been discovered are critical for understanding planet formation processes. A look at a new find in context of earlier work. www.centauri-dreams.org/2025/06/06/o...

Troubling discrepancy on speed of universe's expansion has pitted cosmic microwave background data against evidence from Type 1a supernovae. New work out of U. of Chicago uses JWST data to close the gap. Problem resolved? Maybe. www.centauri-dreams.org/2025/06/03/e...

How many civilizations may have existed in the galaxy millions (or billions) of years before our own? Temporal coincidence may be an issue for detecting megastructures like Dyson swarms. New paper shows how they degrade over time. www.centauri-dreams.org/2025/05/29/m...

Looking for biosignatures is already controversial & will continue to be so. But a null detection can be a useful thing in any case. Alex Tolley examines how we use Bayesian statistics to better understand the probability of life elsewhere. www.centauri-dreams.org/2025/05/23/t...

Unusual optical pulses detected in SETI search explored in new paper. Phenomenon has repeated thrice & baffles researcher Richard Stanton. Hard to explain how these pulses occur but considering them as SETI source is equally unlikely. More on Centauri Dreams: www.centauri-dreams.org/2025/05/20/u...

Turbulence as a factor in shaping the interstellar medium, now simulated to highest degree ever. Ever changing plasma flows have bearing on star formation and solar wind characteristics, and work on a galactic level. Implications for starflight. www.centauri-dreams.org/2025/05/16/e...

Measuring how a star oscillates depends on precise radial velocity measurements. We're getting really good at this, as new work with implications for both stars & their exoplanets confirms. The orange dwarf HD 219134 is a case in point: www.centauri-dreams.org/2025/05/13/h...

Communicating w/ alien civilizations poses conundrums Michael Chorost explores in a worldbuilding exercise for a novel about insect-like intelligence. Writing process & perspective-shifting methods offer deep challenges. www.centauri-dreams.org/2025/05/09/w...

Brown dwarfs, which are less massive than stars and more massive than planets, have weather in their atmospheres and it has been measured for a nearby brown dwarf using JWST 🧪🔭 www.universetoday.com/articles/web...

Planet Nine, if it exists, may not be alone in the far outer system. New work trying to observe this world finds a potential hit, but it doesn't square with what appears to be disturbing other outer object orbits. Yet another planet? www.centauri-dreams.org/2025/05/06/i...

The Voyagers are still hanging on, & New Horizons is quite productive after 19 years. Latest: Mapping of Local Bubble within which Solar System resides (hot plasma left over from supernovae). Bit by bit, we're feeling our way into the dark. www.centauri-dreams.org/2025/05/02/n...

A vast molecular cloud turns up much closer to the Sun than the Orion Nebula. Its discovery is a marker for how we're beginning to chart nearby interstellar space, a prerequisite if we are ever to navigate regions of dust and gas at a percentage of lightspeed. www.centauri-dreams.org/2025/04/29/c...

Sudden complexity of Earth life in the Cambrian & earlier Ediacaran eras may be explained by collapse of magnetic shield strength. New theory is gaining adherents based on paleomagnetic evidence. Implications for astrobiology. www.centauri-dreams.org/2025/04/25/m...

JWST data are shaping our view of 'sub-Neptune' planets. Maybe the ocean world hypothesis needs a second look. This is part 2 of my examination of where the debate now stands. www.centauri-dreams.org/2025/04/22/t...

K2-18b just may be a water world under a hydrogen atmosphere, the category dubbed 'hycean' for hydrogen/ocean. Interesting detection of potential biosignatures here, but let's scrutinize carefully. Some thoughts: www.centauri-dreams.org/2025/04/18/a...

Is the famous 'Wow' signal from Ohio State in 1977 result of a natural process? New paper suggests how it might have occurred. Jim Benford discusses this, along with his own thought that Wow might have been evidence of power beaming, accidental catch from ETI. www.centauri-dreams.org/2025/04/15/n...

We usually think about Europa re subsurface oceans, but Titan seems to have an ocean too. A new paper looks at prospects for some kind of life beneath the ice. This early modeling allows for the possibility, but if life is there, it's likely not widespread. www.centauri-dreams.org/2025/04/11/i...

Flare activity on Proxima Centauri may be even more harmful to nearby planets (think Proxima b, in the habitable zone) than we thought. A multiwavelength study makes it clear we've underestimated their power in previous work. Implications for life? www.centauri-dreams.org/2025/04/01/a...

A generation ship to Proxima Centauri. Travel time 250 years. Can a stable population be achieved onboard and reach its destination? Fascinating thoughts from Centauri Dreams regular Alex Tolley on Project Hyperion, an attempt to design such a craft. www.centauri-dreams.org/2025/03/28/c...

If we could spread life through the galaxy, should we? Directed panspermia assumes life is so rare elsewhere that we need to send it from Earth. But there are ethical issues here that a new paper explores. And an odd term: 'astronomical suffering.' www.centauri-dreams.org/2025/03/25/t...

Super-Earths and mini-Neptunes may emerge in specific zones within protoplanetary disks. If so, implications are for fewer Earth-sized planets than we've been anticipating. I go through the new paper on this today on Centauri Dreams. www.centauri-dreams.org/2025/03/20/w...

Interesting correlations between two mass extinctions and supernova activity in the relatively nearby Scorpius-Centaurus association of young stars. Nothing definitive, but the evidence is intriguing. www.centauri-dreams.org/2025/03/14/a...