“There is an asteroid, discovered in December 2004, called Apophis. Named for the Egyptian god of death and darkness. It was named only after its trajectory was identified to intersect that of Earth… Turns out, in the year 2029, in the month of April… Apophis will come so close to Earth that it will dip below our orbiting communications satellites. And it is the size of the Rose Bowl. It will be the largest, closest thing we have ever observed to come by Earth. The orbit we now have for it is uncertain enough—because these things are hard to measure and hard to get an exact distance for—that we cannot tell you exactly where that trajectory will be. We know it won’t hit Earth, but we know it will be closer than the orbiting satellites. There is a range, a 600-mile zone, called the keyhole. If the asteroid goes through the middle of the keyhole, it will hit the Earth 7 years later. It will hit the Earth 500-kilometres west of Santa Monica. Now, that’s if it goes through the centre [of the keyhole]; if it goes through the centre, it hits the Pacific Ocean, plunges down into the Pacific to a depth of 3 miles, at which point it explodes, cavitating the Pacific in a hole that’s 3 miles wide, three 3 deep. That will send a tsunami wave outward from that location that’s 50 feet high. 5 storeys.”
—
Neil deGrasse Tyson, Revolving & Evolving (via cocknbull)
um.
NASA begs to differ:
Using criteria developed in this research, new measurements possible in 2013 (if not 2011) will likely confirm that in 2036 Apophis will quietly pass more than 49 million km (30.5 million miles; 0.32 AU) from Earth on Easter Sunday of that year (April 13).
Much more at the NASA link.
Lemkin 