1873: On 20 September 1873, Giovanni Battista Donati died.
An Italian astronomer, Donati was the first to observe the spectrum of a comet (Comet 1864 II on 5 August 1864). This observation indicated correctly that comet tails contain luminous gas and do not shine merely by reflected sunlight.
Meedia modaal
18 September
17 September
16 September
püsige kursis
Telli meie uudiskiri, et saada uusimad uudised, missioonide värskendused ja eksklusiivsed ülevaated otse oma postkasti. Ole esimeste seas, kes saab teada meie tulevastest projektidest ja läbimurretest.