27 FEB. 2004
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1908: On 21 January 1908, Bengt Strömgren was born in Copenhagen, Denmark.
Strömgren made important research in stellar structure in the 1930s, but he is best known for his theory of the ionised gas clouds around hot stars.
He found relations between the gas density, the luminosity of the star, and the size of the 'Strömgren sphere' of ionised hydrogen around it.
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19 January
1747: On 19 January 1747, Johann Elert Bode was born in Hamburg, Germany.
18 January
2004: On 18 January 2004, the OMEGA instrument on ESA's Mars Express mapped the South polar cap of the Red Planet.
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