An asteroid the size of a city block will pass by Earth this weekend, but have no fear: There's no danger of it hitting our planet. The 80-meter (262 feet) wide asteroid makes its closest approach to Earth on Saturday afternoon in the United States. It will be about 975,000 kilometers (604,500 miles) away, said Don Yeomans, a planetary scientist at NASA's Jet Propulsion Laboratory in California. That's about 2 1/2 times the distance from the Earth to the moon. "It's a pretty good size, but it's not getting that close, at least by recent standards," Yeomans said. The asteroid...