How Did Concrete Save This Boeing Plane?

By Jesus Diaz on at

There's a simple reason why this Boeing 737 wasn't destroyed this week at Jiuzhai Huanglong Airport, China, and instead destroyed this concrete runway using its landing gear: it's neither a runway nor concrete. At least, not in the traditional sense.

Earth Has a Second Moon, Says Astronomers

By Jesus Diaz on at

In a research paper called "The population of natural Earth satellites", astronomers say that Earth must have a second moon at any given time. They have calculated the population of "irregular natural satellites that are temporarily captured" by Earth.