Daily Extra :
Astronomy & Space Word of The Day
kinetic energy: The energy of motion; equivalent to one-half an objects mass multiplied by its velocity squared.
Today in History:
1947: Max Karl Ernst Ludwig Planck died in Göttingen, Germany
1957: the USSR launched the world's first artificial satellite, Sputnik 1.
1959: Luna 3 - USSR Lunar Far Side Flyby launched. Encountered the Moon on October 7, 1959 and returned the first image of the Moon's hidden side. Space probe is now in a decayed earth-moon orbit.
1965: Luna 7 - USSR Lunar Soft Lander launched. Luna 7 failed and impacted the moon.
1957: Sputnik-1 launched. First artificial satellite.