Near-Earth object focused on asteroids and short-period comets. CNEOS even restricts its definition of NECs to short-period comets—, 107 such objects have been discovered. , only 20 comets have been observed to pass within of Earth, including 10 which are or have been short-period comets. Two of these comets, Halley's Comet and 73P/Schwassmann–Wachmann, have been observed during multiple close approaches. The closest observed approach was 0.0151 AU (5.88 LD) for Lexell's Comet on July 1, 1770. After an orbit change due to a close approach of Jupiter in 1779, this object is no longer a NEC. The closest approach ever observed for
From the Earth to the Moon (film) laws. When it is discovered that Virginia has stowed away, Nicholl cooperates with Barbicane in a desperate attempt to save her. Sharpe is knocked out, and he and Virginia are placed in the safest compartment of the ship. Barbicane and Nicholl then fire rockets that send the young couple on their way back to Earth, while the two scientists land on the Moon in another section, with no way off. They are able to signal to the young couple that they have reached the Moon safely. Location shooting for "From the Earth to the Moon" took place in Mexico. Various