construction. The heavier bodies, like iron-laden rocks, are the ones most likely to actually impact the planet. That impact would throw up insane amounts of debris, release levels of destruction akin to several nuclear bombs, and leave a permanent terrain-changing impact crater for thousands of years. The more loosely constructed dust and ice asteroids, however, can’t always take the increased pressure from Earth’s atmosphere, and usually explode
Unfortunately, if an asteroid is on a direct collision course with Earth, that very fact makes it less likely we’ll be able to see it until it’s far too late. Typically, we track asteroids by virtue of their movement parallel to us. But when they’re coming right for us, we can’t see them moving. They just look like beautiful, harmless specks of light. But even more worrisome are the asteroids already inside Earth’s orbital path—the ones whose path the Earth is intersecting with regularly, the ones closest to us, the ones most likely to hit; we can’t see those asteroids because they’re so close to us that they’re backlit by the sun. Remember the old campfire horror story about the babysitter trying to trace the threatening phone calls she’s been receiving? Well, that babysitter is us, and that serial killer is the asteroids, and good lord! I—I hate to break it to you, but… those phone calls are coming from
• “I alw—”
• “Get u—”
• “Oh go—”
• “Whatthefuckisthat?”
To give us a better shot at avoiding secret, invisible, flaming space death, a team of researchers in Canada is launching a small satellite telescope to help us spot these near-orbit asteroids better, but it’s a low-budget venture and it could do only so much. And while something is always better than nothing, keep in mind that there are more than five thousand asteroids dangerously close to Earth that have already been discovered using just our meager existing technology—it’s kind of hard to get stoked about the mere
But hey, don’t worry, the government is totally on this one: A more official (well, more official than Canada anyway) approach is already under way. The U.S. Congress has introduced the NEO Preparedness Act, a bill mandating that we create a special program called the Office of Potentially Hazardous Near-Earth Object Preparedness, which would develop the technology to track 90 percent of all near-earth objects (NEOs), even those as small as 140 meters, by the year 2020. You better believe NASA’s on that shit too; they’ve decided that we would need a much larger version of Canada’s tracking satellite in place, preferably near Venus’s orbit, to achieve this Congress-mandated goal. Unfortunately, it would cost about 1.1 billion dollars for fifteen years of operation, and that’s just not in NASA’s budget. Also unfortunately, Congress is far too busy asking if baseball players are really as strong as they seem and trying to choke bankers with wads of cash to grant more funds to such trifling matters as the avoidance of space bullets, so they won’t give NASA the money. NASA scientists have stated that they intend to get to work on pursuing other, less costly plans, but seeing as how Congress is probably scheduling appointments to review whether wrestling is real and appointing a committee to decide exactly how awesome the last season of
But maybe we’re getting ahead of ourselves. The last one of these asteroids to initiate an extinction-level event was more than 65 million ago, so how present is this danger, really?
Well, in 1908 we had a little practice drill for an ELE when a chunk of rock half the size of a football stadium exploded over Siberia, initiating a blast with the strength of about fifteen megatons—roughly one thousand times the strength of the bomb that fell on Hiroshima. With temperatures reaching 5,000 degrees, the impact destroyed two thousand square kilometers of forest—literally laying the trees out flat on their sides in enormous radial circles like a satanic Spirograph.
One witness, stationed at a local trading post, described what he saw:
Suddenly in the north sky… the sky was split in two, and high above the forest the whole northern part of the sky appeared covered with fire.… At that moment there was a bang in the sky and a mighty crash.… The crash was followed by a noise like stones falling from the sky, or of guns firing. The earth trembled.
This man witnessed an event
It was ominously phrased prophecies of doom delivered by traumatized, grizzled old Russians like that that spurred interest in the NEO Preparedness Office, which would not only track future potential meteor impacts through orbital telescopes, but is intended to help research and fund a plethora of solutions. Apparently operating under the Kitchen Sink philosophy of panicking and throwing everything we have at any potential threat, NASA proposes to use everything from “gravity tractors” to “a shit-ton of nuclear missiles” to deter impacts. That gravity tractor idea sounds pretty crazy, but really it’s just a plan to send a spaceship to tow the asteroid away. Some other proposed solutions, like firing a solar laser at it, or wrapping it entirely in plastic like a planetary Hot Pocket, are far more bizarre. The most practical solution on the table is that aforementioned nuclear blast, but there’s a major problem that prevents us from even nuking the damn thing: Blasting an asteroid apart preimpact could just fragment it into thousands of smaller but still Earth-impacting meteoroids. So now instead of a punch to the face, we’ve turned it into a shotgun blast. A nuclear shotgun blast aimed right at us. And that’s our best option!
• Blow the fucking thing up.
• Divert it.
• Like, push the Earth out of the way somehow?
• Last idea is stupid. How can you push a planet?
• Bigger gravity tractor.
• Invent Hulk, have Hulk punch.
• Ask Jesus.
But one possible solution to this problem is the concept of nuclear pulse propulsion—essentially, using nuclear blasts as a kind of engine to push the meteor away from us without damaging it. They want to use nuclear explosions as the
And even if nature, fate, and God don’t conspire to seal our fates with a giant rock kiss, we just might do it ourselves. Carl Sagan, in his book