Astronomy Picture of the Day . ... Launched in 1977, Voyager 1 is now about 12 light-hours or 90 astronomical units (AU) from the Sun, making this spacecraft humanity's most distant ambassador to the cosmos. ... Leonids Over Indian Cove . ... Canis Major Dwarf: A New Closest Galaxy . ... For many years astronomers thought the Large Magellan Cloud (LMC) was closest, but its title was supplanted in 1994 by the Sagittarius dwarf galaxy. Leonids from Leo . ... Is Leo leaking? ... Jupiter Portrait . ...