On this day in 1887 - October 25th - American astronomer Henry Norris Russell was born.
Russell was one of the major figures of early 20th century astronomy. He's best known for his development of the Hertzsprung-Russell diagram which demonstrates stellar evolution. (Danish astronomer Ejnar Hertzsprung independently made the same discovery.)
On this day in 2006 - October 25th - NASA launched STEREO.
STEREO is a solar observation mission which uses two identical spacecraft in two slightly different orbits. That permits stereoscopic imaging of the Sun. The mission was originally planned to last for two years, but is still in operation.
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