Daily Extra :
Astronomy & Space Word of The Day
Astronomy & Space Word of The Day
terminator: The dividing line between the illuminated and the unilluminated part of the moon's or a planet's disk. The line of sunrise or sunset on a planet or its satellite. At dawn and dusk when the sun is lowest in the sky (low sun), topographic features cast their longest shadows. This reveals information about the size and shape of the objects casting the shadows. Therefore, features near the terminator are imaged in order to obtain morphologic information.
Today in History:
1928: Goddard launches third liquid fuel rocket, four times larger than previous models, reaches 60 mph.
1928: Goddard launches third liquid fuel rocket, four times larger than previous models, reaches 60 mph.
1968: Apollo 8 - USA Lunar Manned Orbiter (December 21-27, 1968) Crew: Frank Borman, James A. Lovell, Jr., William Anders. The crew undertook the first manned lunar fly-around and Earth return. The astronauts made 10 orbits of the moon on Christmas Eve.
