Gemini IV
Gemini IV astronaut Ed White floats outside his spacecraft during the first American spacewalk, on June 3, 1965. [NASA]
Callisto
An ocean of liquid water may lie below the icy, battered crust of Jupiter’s moon Callisto, which is shown in…
Iapetus
Saturn’s two-toned moon Iapetus is one of the most contrasting bodies in the solar system. One hemisphere is almost pure…
Omega Centauri
Omega Centauri, the largest star cluster in the Milky Way, sparkles in this view from Hubble Space Telescope. The cluster…
A Woman and Her Telescopes
Nancy Grace Roman, who was born 100 years ago, was a pioneer in the development of Hubble Space Telescope. At…
Wandering Pole
Earth’s north magnetic pole is sprinting across the Arctic, as shown in this map. In 1831, it was centered at…
Bubbling Sun
Bubbles of hot gas as big as Texas roil the surface of the Sun in this 2020 view from the…
Windy Planet
Winds howl through the upper atmosphere of the planet WASP-127b in this artist’s concept. Winds on the giant planet, which…
Beehive Cluster
The Beehive star cluster sparkles in this view from a ground-based telescope. The Moon and Mars appear quite close to…
Deco Dome
An artist’s rendering from near the time of its dedication depicts the dome of the 82-inch telescope at McDonald Observatory.…