Camping with the Planets Earth's slender crescent Moon will glide by two brilliant planets in the dawn sky this week as it heads for a close encounter with Mercury on July 29. For more information on cresent moon Oceans and continents, forests and factories are all incorporated into the satellite figures. Ulysses spacecraft has an unexpected encounter with Comet Hyakutake NASA Science News home Strangers in the Night During an unplanned rendezvous, the Ulysses spacecraft found itself gliding though the immense tail of Comet Hyakutake. Future science missions for the ULDB will study the source of cosmic rays generated from shock waves emanating from supernovae and will perform surveys of X-ray emiting objects in the universe, search for planets around other nearby stars and will study other objects in space, including the Sun. Web Links Planet Hunters on Trail of Worlds Smaller than Saturn - from the Hubble Space Telescope Science Institute.
Brown dwarfs have too little mass to sustain significant nuclear reactions in their cores.