While most of us on the West Coast of the United States were getting ready for work, a significant astronomical event occurred without many of us knowing. A bus-sized asteroid passed within 37,000 miles of us– almost one-fifth of the distance from the Earth to the Moon. Scientists say the object, named 2012 BX34, had no chance of hitting the Earth. Still, 2012 BX34 made news considering it was among the top 20 of closest recent approaches by an asteroid.
Even if a bus-sized asteroid were on a collision course with the Earth, it would unlikely pose a threat and instead burn-up in the atmosphere. Still, such events remind us that astronomers are always scanning the skies for bigger chunks of rock.
Neil deGrasse Tyson, director of the Hayden Planetarium at the American Museum of Natural History in New York City, described what would happen if a stadium-sized asteroid were strike the Earth in a highly entertaining (and eye-opening) talk at the Commonwealth Club:
Neil deGrasse Tyson: Attack of the Killer Asteroid from Commonwealth Club on FORA.tv

