Communion Of Dreams


Location, location, location.

It really does seem to be a pretty universal law:

On the role of GRBs on life extinction in the Universe

As a copious source of gamma-rays, a nearby Galactic Gamma-Ray Burst (GRB) can be a threat to life. Using recent determinations of the rate of GRBs, their luminosity function and properties of their host galaxies, we estimate the probability that a life-threatening (lethal) GRB would take place. Amongst the different kinds of GRBs, long ones are most dangerous. There is a very good chance (but no certainty) that at least one lethal GRB took place during the past 5 Gyr close enough to Earth as to significantly damage life. There is a 50% chance that such a lethal GRB took place during the last 500 Myr causing one of the major mass extinction events. Assuming that a similar level of radiation would be lethal to life on other exoplanets hosting life, we explore the potential effects of GRBs to life elsewhere in the Galaxy and the Universe.

 

What that means is summed up in this article. Here’s the conclusion:

Astronomers have long known that the Earth occupies a unique position in the solar system that allows life to flourish. This idea of a habitable zone now allows them to focus search for exoplanets that might also have conditions that are right for life. Now they can take this further by excluding inhospitable regions of the galaxy, and searching only those stars and galaxies that exist in the universe’s habitable zones.

 

Of course, that’s just for life as we know it

 

Jim Downey

 



A crack?

Interesting news item on NPR this morning:

Close Encounters Of The Radio Kind? Mystery Bursts Baffle Astronomers

Astronomers have a mystery on their hands. Two large radio telescopes, on opposite sides of the planet, have detected very brief, very powerful bursts of radio waves.

Right now, astronomers have no idea what’s causing these bursts or where they’re coming from. And nothing has been ruled out at the moment — not even the kind of outrageous claims you’d expect to see in tabloid headlines.

* * *

As you would imagine, there’s been lots of speculation about what’s behind these mysterious bursts. Some astronomers think they’re caused by blitzars, pulses of energy from a supermassive star collapsing into a black hole. Others think they may be caused by power solar flares coming from stars nearer by.

And Lorimer says he has to mention it: “There’s even been discussions in the literature about signatures from extraterrestrial civilizations.”

 

From Chapter 1 of  Communion of Dreams when news of the discovery of an evidently alien artifact on Titan is being discussed:

The man sitting next to him got up, stepped up to the holo of the artifact still rotating there in the center. Robert Gish was a little unkempt, his beard untrimmed, his dark hair matted. He was out of shape, almost flabby in appearance. His scientific reputation was as unconventional as his looks. More so. He had been responsible for the radical change in long-range sensing which led to the development of the Advanced Survey Array. Nobel Prize stuff. A true genius, not just brilliant but able and willing to make leaps that took others years to understand. Which was why Bradsen had him here: Gish had been saying for decades that there was other intelligent life among the stars. Saying it so loud and so often that he was considered a crank, since he had no proof and couldn’t even really explain why he believed it to be so, at least in a way that others could accept.

Reaching out as though he was going to touch the object, he said quietly “We know what it is. It is a crack in our shell.”

 

Interesting news, indeed.

 

Jim Downey



What a difference a week makes.

Just think — all the folks who are prepping to deal with some global emergency almost got a chance to see how well their theories work in practice. My friends who are into Steampunk and the SCA would have reigned supreme!

Earth survived near-miss from 2012 solar storm: NASA

Back in 2012, the Sun erupted with a powerful solar storm that just missed the Earth but was big enough to “knock modern civilization back to the 18th century,” NASA said.

The extreme space weather that tore through Earth’s orbit on July 23, 2012, was the most powerful in 150 years, according to a statement posted on the US space agency website Wednesday.

* * *

“If the eruption had occurred only one week earlier, Earth would have been in the line of fire,” said Daniel Baker, professor of atmospheric and space physics at the University of Colorado.

 

Ah well. Better luck next time!

 

Jim

 



Pennies in heaven.

Well, a single penny, anyway. And it’s on Mars. But you know what I mean.

Cool story:

Rare Coin Found on Mars!

It’s true.  At this moment there is a rare coin on Mars.  Specifically, the coin is a 1909 ”V.D.B.” Lincoln-head American penny.

The question is, why is this penny on Mars?

 

Go read it and find out.

Reminder: tomorrow is the third anniversary of Her Final Year being published! Remember to get your FREE copy!

Oh, and there’s a brief new review on Amazon of Communion of Dreams you might want to check out. And while you’re there, why not leave your own review? It helps. Thanks.

 

Jim Downey

‘Penny on Mars’ story via MetaFilter.



“It’s a way to frame the problem,”

As something of a follow up to my last post, there’s a great little item about the development of the Drake equation over on National Geographic. Here’s a good passage:

It’s this kind of guesswork that tends to inflame the Drake equation’s critics, those who complain that the equation isn’t predictive, is too open-ended, and doesn’t provide any answers. But “predictive” isn’t really what Drake ever intended.

“It’s a way to frame the problem,” says MIT astrophysicist Sara Seager, about the equation. “In science, you always need an equation—but this isn’t one you’re going to solve. It just helps you dissect everything.”

Definitely worth reading, as well as thinking about.

Jim Downey



You are here.*

Sometime when I’m really bored I may go to the trouble to try and figure out when the first variety of this image was made — I remember it back to my childhood (I think … you know how tricky memories are):

 

 

Nice little bit of perspective, eh? Which of course is why it has become such a classic image in one form or another.

And that little bit of perspective gives rise to a very nice explanation and exploration of the Fermi Paradox (which I have written about/mentioned many times) over on Wait But Why. Here’s a bit from the closing paragraphs:

As we continue along with our possibly-futile search for extraterrestrial intelligence, I’m not really sure what I’m rooting for. Frankly, learning either that we’re officially alone in the universe or that we’re officially joined by others would be creepy, which is a theme with all of the surreal storylines listed above—whatever the truth actually is, it’s mindblowing.

Beyond its shocking science fiction component, The Fermi Paradox also leaves me with a deep humbling. Not just the normal “Oh yeah, I’m microscopic and my existence lasts for three seconds” humbling that the universe always triggers. The Fermi Paradox brings out a sharper, more personal humbling, one that can only happen after spending hours of research hearing your species’ most renowned scientists present insane theories, change their minds again and again, and wildly contradict each other—reminding us that future generations will look at us the same way we see the ancient people who were sure that the stars were the underside of the dome of heaven, and they’ll think “Wow they really had no idea what was going on.”

 

Of course, this whole question is at the very heart of Communion of Dreams. And, in a way, also at the heart of St Cybi’s Well. You’ll see.

But for now, go enjoy that post at Wait But Why. It’s quite good.

 

Jim Downey



Obviously.

If you consider the full implications of what is revealed in Communion of Dreams, this might well be a fairly good explanation …

From the brilliant Randall Munroe, of course. Go to his site to see the ‘hidden text’.

 

Jim Downey




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