An unexpected uptick in birthrates in sub-Saharan African countries could accelerate global population growth. By the end of this century, the world's population could climb as high as 12.3 billion people, according to new estimates.
After 10 months and 442 million miles, the orbiter is scheduled to begin orbiting Mars this weekend. MAVEN will spend a year gathering information about the planet's upper atmosphere, in an effort to learn what made Mars inhospitable to life.
The Boeing Company and Space Exploration Technologies Corp. will soon be ferrying NASA astronauts to the International Space Station. The private contractors will lend the space agency much more than a lift.