Due to "proper motion," or the long-term movement of celestial bodies through space, familiar star constellations like the Big Dipper, Orion and Perseus no longer exist. 250,000 Loihi, a young submarine volcano in the Hawaiian chain, rises above the Pacific Ocean's surface and becomes a new island. 295,000 Voyager 2 vs Sirius probe passes within 4.7 light years of the brightest star in the night sky.