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
Around the Moon sea. This turns out to be the returning projectile, and the three men inside are found to be alive and are rescued. They are treated to lavish homecoming celebrations as the first people to leave Earth. Around the Moon Around the Moon (, 1870), Jules Verne's sequel to "From the Earth to the Moon", is a science fiction novel which continues the trip to the moon which was only partially described in the previous novel. It was later combined with "From the Earth to the Moon" to create "A Trip to the Moon and Around It". "From the Earth to