NASA shares mid-sized robotic lunar lander concept with industry
As NASA presses forward with the agency's mission to the Moon, Mars and beyond, the development of top-tier technology is critical to success. With emphasis on lunar exploration and scientific investigation, the desire to deliver a wide variety of payloads to the Moon has increased.
Smog in Iran shuts schools, universities
Air pollution forced the closure of schools and universities in parts of Iran on Saturday, including Tehran, which was cloaked by a cloud of toxic smog, state media reported.
Science warnings, US retreat add urgency to UN climate talks
Mass protests, a last-minute venue change and talk of climate tipping points are adding some unplanned drama to this year's international talks on tackling global warming.