The Yellowstone supervolcano's last eruption wasn't a single event, but 2 closely-spaced eruptions that put the brakes on a natural global-warming trend, says a study.
In recent years, the International Space Station has given astronauts the chance to photograph transient luminous events - or TLEs - natural light shows produced at the tops of thunderstorms.
La Niña (or not) is the biggest wildcard in how this year’s winter might shape up. Overall, NOAA's outlook suggests a relatively cool, wet U.S. North - and warm, dry U.S. South - this winter.
Social media was buzzing on Monday with photos and accounts of the red sun over the UK. British weather forecasters said it was dust from the Sahara, raised via Hurricane Ophelia.