Daily Extra :
Astronomy & Space Word of The Day
Doppler Effect: The apparent change in wavelength of sound or light caused by the motion of the source, observer or both.
Who Was Born Today?:
1723: Christopher Wren, England, astronomer/architect, age 90
Who Died Today?:
Today in History:
1979: Soyuz 32 carries 2 cosmonauts to Salyut 6 space station is launched
