The Earth and Moon, taken on Sept. 18, 1977, by Voyager 1 when it was 7.25 million miles (11.66 million km) from Earth. Voyager 1 was directly above Mt. Everest (on the night side of the planet at 25 degrees north latitude) when the picture was taken.
Jupiter and two of its satellites (Io, left, and Europa) on Feb. 13, 1979. Io is about 350,000 km (220,000 mi.) above Jupiter's Great Red Spot; Europa is about 600,000 km (375,000 mi.) above Jupiter's clouds.
Volcanoes erupting on the rim Io, which were likely active for at least four months. The gravitational flexing caused by Jupiter itself and Io's sister moons generate the heat that leads to volcanoes.