The East African Rift System is a 4,000-mile-long, 22-million-year-old zone that extends from Jordan to Mozambique. And it's ...

The X-15 is the only conventional aircraft that has ever been flown above the “Karman Line” separating the Earth’s atmosphere from space ... flight aboard the North American X-15.

parts of Africa, the Arabian Sea and South Asia. North America was not among the possible impact locations. The chance is so low that astronomers are not yet concerned about YR4. Still, space ...