%2d outputs a decimal (integer) number that fills at least 2 character spaces, padded with empty space. %6.2f outputs a floating point number that fills at least 6 character spaces (including the decimal separator), with exactly 2 digits after the ., padded with empty space. Good for dollar and pound currency amounts.
Asteroid hurtles towards earth. Scientists were today, January 4th, 2014, warning of a possible asteroid collision with the Earth.
Again, that might depend on exactly where the rock lands. We know that the Earth has been hit by some very large asteroids that have barely registered as life destroyers. The Manicouagan crater in Canada - one of the largest impact craters on the planet - was created in a destructive impact about 215 million years ago.