Well, it depends on who you ask. Ukranian scientists are saying they’ve discovered a 1,300 foot humdinger called 2013 TV135 (which we shall rename “Merchant of Death”) that is going to land in 19 years and that will pretty much do it for earth. Well, that might be an exaggeration—but it is very big and the Ukraine is very worried. NASA, however, doesn’t seem to be breaking a sweat. “We’ve had nine days to study this, and I would say it has a one in 48,000 chance of hitting Earth, and as we gather more data on it, we believe it will eventually go down to zero,” Dr. Paul Abell told ABC News. That’s a 0.0021 percent chance which, admittedly, isn’t very high—although it’s a good deal higher than we’d like it to be …