28 March
1807: On 28 March 1807, Vesta 4, the only asteroid visible to the naked eye, thus the brightest on record, was first observed by the German astronomer Heinrich Wilhelm Olbers.
02 FEAB. 2005
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1804
Amhairc
1974: On 29 March 1974, the first probe to Mercury, Mariner 10, arrived at the planet.
Mariner 10 eventually made three flybys of Mercury from 1974 to 1975 before running out of attitude control gas. The probe revealed Mercury as a heavily cratered world with a mass much greater than thought. This would seem to indicate that Mercury has an iron core which makes up 75 percent of the entire planet.
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25 March
1655: On 25 March 1655, Christiaan Huygens discovered Titan, a moon of Saturn.
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