2009 – Mars Rover Spirit Hits 2,000 Sols. A Martian Day lasts about 40 minutes longer than an Earth Day. Since Spirit’s landing in 2004 it has driven 4.8 miles.
1999 –
Cassini completes Earth flyby. See .mov file here. (Cassini 3D)
1985 – Suisei launched. Japan’s second deep space mission to study Comet Halley. Cometary water, carbon monoxide and carbon dioxide ions were detected.
1868 – Norman Lockyer first sees helium in the Sun‘s spectrum.