Two asteroids passed near Earth yesterday, closer than the moon.
- Two asteroids are passing close by Earth today.
- The second space rock will be less than 48,000 miles away — about one-fifth the distance to the moon.
- The two space rocks were located just Sunday.
About 20 percent of the known near-Earth asteroids are considered potentially hazardous because of their size and because their orbits come within 4.6 million miles of the planet. NASA is in the process of building a catalog of near-Earth objects that are at least a kilometer, or .62 miles, in diameter.