These wide Australian floodplains are unique on the planet. Scientists think they are caused by the extreme variation in water and sediment discharges from the local rivers.
An astronaut caught an unlikely glimpse of a wide swath of Greenland, which is often cloud-covered and far from the northernmost orbit of the space station.
Aden lies near the south end of the Red Sea, at a critical point where major sea lanes converge—between Egypt and the Mediterranean Sea, the Persian Gulf and India, and the long shoreline of East Africa.
An astronaut aboard the International Space Station adjusted the camera for night imaging and captured the green veils and curtains of an aurora that spanned thousands of kilometers over Canada.