Keith Cooper's The Contact Paradox is as thoroughgoing a look at the issues involved in SETI as I have seen in any one volume. After I finished it, I wrote to Keith, a Centauri Dreams contributor from way back, and we began a series of dialogues on SETI and other...
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Boundary Conditions for Emergent Complexity Longevity
We usually think about habitability in terms of liquid water on the surface, which is the common definition of the term 'habitable zone.' But even in our own system, we have great interest in places where this is not the case (e.g. Europa). In today's essay, Nick...
Engineered Exogenesis: Nature’s Model for Interstellar Colonization
Is seeding life into the universe to be a part of the human future? Space probes conceivably could be doing this inadvertently, and the processes of panspermia also may be moving biological possibilities between planets and even stars. Robert Buckalew has his own take...
Life from a Passing Star
Remember 'Nemesis'? The idea was that mass extinctions on Earth recur on a timescale of between 20 and 40 million years, and that this recurrence could be accounted for by the existence of a faint star in a highly elliptical orbit of the Sun. Put this object on a 26...
Detection of an Interstellar Meteor
Do we have a second interstellar visitor, following on the heels of the controversial ‘Oumuamua? If so, the new object is of a much different nature, as was its detection. In 2014, a meteor north of Manus Island, off the coast of Papua New Guinea produced a powerful...
Is Most Life in the Universe Lithophilic?
Seeking life on other worlds necessarily makes us examine our assumptions about the detectability of living things in extreme environments. We're learning that our own planet supports life in regions we once would have ruled out for survival, and as we examine such...
‘Oumuamua: New Work on Interstellar Objects
Anomalous objects are a problem -- we need more than one to figure them out. One 'hot Jupiter' could have been an extreme anomaly, but we went on to find enough of them to realize this was a kind of planet that had a place in our catalog. Or think of those two Kuiper...
Pulsar Navigation: Exploring an ETI Hypothesis
Pulsar navigation may be our solution to getting around not just the Solar System but the regions beyond it. For millisecond pulsars, a subset of the pulsar population, seem to offer positioning, navigation, and timing data, enabling autonomous navigation for any...
Interstellar Communication Using Microbes: Implications for SETI
Mention Robert Zubrin's name and the planet Mars invariably comes up, given his long-time work on finding ways to establish a human presence there. Dr. Zubrin is the originator of Mars Direct, the author of The Case for Mars, and founder of the Mars Society. But his...
Habitable Planets in the Same System
Learning that our own Solar System has a configuration that is only one of many possible in the universe leads to a certain intellectual exhilaration. We can, for example, begin to ponder the problems of space travel and even interstellar missions within a new...