June 2014

Building the Bowl of Heaven

June 30, 2014

Because his new novel Shipstar had just reached the top of my reading stack, and because I had been writing about Shkadov Thrusters last week, I asked Gregory Benford if he could provide a deeper explanation of how these enormous structures might work. Greg had already noted in an email to me that a Shkadov […]

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Stars as Stellar Engines

June 27, 2014

I’ve always loved the idea of an O’Neill space habitat because of the possibility of engineering a huge environment to specification. That notion translates well to worldship ideas — a multi-generational journey would certainly be easier to take in an environment that mimicked, say, a Polynesian island, than aboard something more akin to a giant […]

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Intergalactic Travel via Hypervelocity Stars

June 26, 2014

We’ve been looking at not just interstellar but intergalactic crossings in the past few days, something of an homage to Carl Sagan, whose enthusiasm for continuous acceleration at 1 g and relativistic time dilation was immense in the years shortly after Robert Bussard’s key paper on interstellar ramjets. Without a working ramjet and largely unaided […]

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Sagan’s Andromeda Crossing

June 25, 2014

When Carl Sagan and Iosif S. Shklovskii discussed travel to another galaxy in Intelligent Life in the Universe (Holden-Day, 1966), they considered the problem from the standpoint of the technologies then under discussion by theorists like Robert Forward and Robert Bussard. As I mentioned yesterday, the authors found hibernation interesting, drawing on the ideas of […]

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Deep Time: Targeting Another Galaxy

June 24, 2014

Interstellar flight isn’t about possibility as much as it is about time. We know we can launch a payload to another star if we’re willing to burn up enough millennia — about seventy — to get there in the form of a Voyager-style flyby. That’s with today’s technology, and we can extrapolate how the time […]

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A View of the Deepest Future

June 23, 2014

Adam Crowl first appeared in Centauri Dreams not long after I opened the site to comments about nine years ago. His insights immediately caught my eye and challenged my thinking. I have always admired auto-didacts, and Adam is an outstanding example: “I don’t work in this field nor did I especially train in it,” he […]

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Woven Light: Lesson Arcs

June 20, 2014

Heath Rezabek continues his experiment in possible futures, science fiction with a collaborative bent exploring the archives that may one day preserve the story of our world and the sometimes mysterious processes that may bring them into being. by Heath Rezabek This is the fifth installment in a continuing series of speculative fiction here on […]

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Outer Planet Exploration Strategies

June 19, 2014

I’ll wrap up this week’s outer planet coverage with a look at recent Cassini flybys of Titan, but I also want to put these accomplishments in the context of what we might do with future missions to the ice giants Uranus and Neptune like the proposed ODINUS missions we looked at yesterday. One-off missions to […]

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Return to the Ice Giants

June 18, 2014

Once New Horizons has performed its flyby of Pluto/Charon and, let’s hope, its reconnaissance of a Kuiper Belt object (KBO), what comes next in our exploration of the outer Solar System? Pushing further out, Innovative Interstellar Explorer grew out of a NASA ‘Vision Mission’ study and has been developed at Johns Hopkins University Applied Physics […]

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New Horizons: Hubble Hunts KBOs

June 17, 2014

My guess is that the public thinks of the Hubble Space Telescope largely in relation to deep space objects. The Hubble Ultra Deep Field is a case in point, a region of the sky in the constellation Fornax that is no more than a tenth of the width of a full moon, but one that […]

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