I’ve always found asteroids to be fascinating. They are often surprisingly big, they contain a wealth of information about the history of the Solar System… and, let’s be honest, they’re frightening.
There are thousands of asteroids out there, often collecting in clearly defined belts or gravitationally stable regions known as Lagrangian points. However, many are not so well behaved; they seem to have their own agenda, flying around the Solar System in their own orbits, sometimes buzzing the Earth.
Fortunately, the vast majority of these rocks are harmless; if they hit our atmosphere they might create a dazzling light show, burning up, possibly even exploding as a fireball. Sometimes though, a big asteroid might be observed and astronomers become a little concerned. The next known threat that might hit us is the famous asteroid named Apophis that is expected to make an uncomfortably close encounter with Earth on April 13th, 2036. The odds of Apophis hitting us in 2036 (not 2029 as quoted in the above video) are 45,000:1, which may sound fairly unlikely, but if you start comparing those odds with dying in a plane crash, or being hit by a car, you’ll see that actually, a one in 45,000 chance are the kind of odds you’d happily quote when placing a bet in a Vegas casino. I have a chance!
Yes, and there’s also a chance of a 350 metre-wide asteroid hitting us in 2036, so perhaps we should start planning for the worst?
Fortunately, we have some lead time on Apophis, and we’ll learn more about the chunk of rock when it flies past the Earth in 2029. And that’s what it’s all about: lead time. If mankind spots a potentially deadly asteroid approaching us, we’ll need as much time as possible to nudge it off course.
In a video I just stumbled across on Discovery.com, Joseph A. Nuth III from NASA Goddard Spaceflight Center shares his views on what we could do to prevent a potential asteroid catastrophe. By developing asteroid deflection techniques, we’ll also be presented with an opportunity. As pointed out by Nuth, if we have the ability to deflect an asteroid, perhaps we can steer it into lunar orbit, so we can carry out mining operations…