March 08

1618 - Johannes Kepler discovers the third law of planetary motion.
1934 - A photograph by astronomer Edwin Hubble shows there are as many galaxies in the universe as there are stars in the Milky Way.
1979 - The first extraterrestrial volcano is discovered on Io, a moon of Jupiter.
2014 - In one of aviation's greatest mysteries, Malaysia Airlines Flight 370, carrying a total of 239 people, disappears en route from Kuala Lumpur to Beijing. The fate of the flight remains unknown.