Neighborhood Watch

Last night I had cobbled together a lot of interesting stuff about today’s cosmic near-miss with asteroid 2012 DA14 (a pretty innocuous – even boring – name for something that had the potential to do so much damage). I know the professional astronomers have to catalog this stuff in ways that make sense to them, but something passing inside the orbits of our own weather satellites that’s big enough to flatten a large city should have a more impressive calling card. Like Zul the Destroyer. Or Hoss.

So yes, there was already a good deal of material ready to go but things just got a lot more interesting overnight: Hundreds Injured in Russian Meteorite Event.

Just passin’ through…

Continue reading “Neighborhood Watch”

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Daily Brain Dump

Since I’m in the middle of a big push to finish Terminal Velocity, there won’t be a whole lot of blog pontificating going on here for the next several weeks. Sorry, but there’s only so much time in the day.

To fill the void, I’ll be posting links to stories that catch my interest. Hopefully they’ll catch yours as well. If something really interesting happens, I might even comment on it (surely the suspense is killing you).

I can hear it now: “Nope, it’s not killing me, and don’t call me Shirley.”

So here’s what’s going on in our world today…

Giant killer asteroids to barely miss Earth tonight. Sleep well, kiddies.

Robert Ballard finds evidence of Noah’s Flood. In case you ever thought wayward asteroids were our only problem.

Elon Musk on Mars and Interstellar travel. Nope, he’s not building a warp drive anytime soon.

Michigan becomes a right-to-work state, predictable hilarity violence ensues. Seriously? If your little club is so friggin’ awesome, why do you need the force of law to retain dues-paying members? Welcome to the free market, beeches.

Behind the yoke of Boeing’s new 787 Dreamliner. Yeah, I’d take one.

Why going to the trouble of hiking and camping is worth it. Because nature rocks.

How little we really know about dinosaurs. And by extension, our own world. What might we imagine present-day animals to be if they had to be reconstructed from the same available fossil record? Hint: tree-climbing goats. But no sharks with frickin’ lasers…again.

Wrath of Khan character officially revealed for Star Trek Into Darkness!   Sadly, it’s not the one we’re all hoping for. Yet.

Nope. Not today.

P.S. And if you’re looking for some good holiday reading, Perigee is only 99 cents this week!

Near Misses and Dodged Bullets

Where’s the kaboom?

Interesting goings-on in our night sky recently – check out this amateur video of something big hitting something even bigger: Mysterious Impact Flash on Jupiter.

Now, understand I use the “amateur” term carefully. There’s a huge global network of astronomers out there who do this stuff purely for fun and personal interest. Some of the equipment they have is astounding, and they got mad skillz. Professional astronomers count on these guys for cataloging phenomena that the Big Dogs just can’t devote scope time to: stuff like variable stars, planetary occultations, Martian dust storms, and comets (many of the named comets were discovered by non-professionals).

Apparently that list also includes potential civilization-destroying rogue asteroids.

Yeah, I left the best part for last: from iO9, speculation that perhaps Jupiter took one for the team. There’s been a lot of that lately, come to think of it.

So, are the massive outer planets with their deep gravity wells actually a picket system for the smaller inner planets – namely, the ones that could support life? More specifically, ours?

This is a theory which has been gaining traction over the years. Jupiter, Saturn, Uranus (stop giggling), and Neptune patrol the far reaches of our solar system, sucking in or otherwise diverting species-threatening chunks of rock and ice that otherwise might find themselves on orbits that intersect ours at really inconvenient times. Like, you know, when we’re in the same place.

NEO (Near-Earth Object) detection has been getting more and more attention of late, but an observer’s position on our globe makes a big difference: if you’re in North America, most of the southern sky is permanently out of reach. If you’re in Australia, the problem is reversed. And as I understand it, there isn’t a lot of observing capability in the southern hemisphere. If you look at the distribution of population and land mass, it’s not hard to see why. But the rocks are still out there.

NASA has proposed a manned mission to a NEO using the Orion spacecraft it’s developing, and there are plenty of candidate asteroids out there. I’m all for it if they can afford it. Besides going farther than the Moon, to something humans have never encountered, it’s a good idea to understand these things better so as to be able to deflect or destroy them before one of them eventually gets pitched through the strike zone right into home plate.

So could NASA do it? Sure, if they ever get Orion flying. The whole idea is that it would need less delta-V than a lunar mission and it could be done without a specialized lander – so it’s less of an engineering hurdle and more of a logistics problem. LockMart has already studied this extensively, calling it the “Plymouth Rock” mission.

Could private space do it? Well, ya’ll can probably guess how I feel about that. Once a manned Dragon is ready, I’ll bet SpaceX could put a mission together in short order if they really wanted to.

This is why building routine low-cost access to space is important: it enables us get out there and do something about it. Space travel isn’t easy or inherently safe, but there’s no reason the mechanical aspects of it can’t be made reliable and modular. Which of course is exactly what SpaceX, Bigelow, XCor, Masten, et al., are trying to do.

Think about this: what would you need to put together an asteroid mission?

Well, there’s the transportation up and down: Dragon.

How about a crew habitat and life support? Bigelow Sundancers would be a good start.

Propulsion? I don’t know, maybe existing Centaur kick-stages or whatever that Russian booster Space Adventures is using for their lunar orbit tourist flight.

Get the idea? The basic components either exist or are in development with test articles already flown in orbit. But as they say, the devil’s in the details: radiation shielding being the most obvious. Leaving the protection of the Van Allen belts is a real hazard – the Apollo program didn’t really address it, placing their faith in probability. That is, the missions were of short enough duration that the likelihood of being fried by a Coronal Mass Ejection was acceptably low. But they also recognized that if they kept going, it would eventually happen. A two or three month flight to an asteroid raises the odds significantly.

Which brings us back to my point: none of this is without risk. But nothing worth doing ever is. In the meantime, if you want to get a good idea of the sort of widespread mayhem even a relatively small asteroid or comet could produce, check out this handy little Calculator of Mass Destruction.

And be thankful that our solar system has been blessed with these gas giants which are not only nice to look at, but which protect us from all manner of big space junk.