Pierre Janssen
- Pierre Jules César Janssen (22 February 1824 – 23 December 1907), also known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited wit
French astronomer Pierre Janssen discovered Helium on August 18, 1868 in Guntur (Madras state) now in Andhra Pradesh. He was observing solar eclipse and noticed the yellow spectral emission..查看文章
That's the path Dutch forward Vincent Janssen was on until last week when he scored in ... this summer as a counter-argument to crosstown rival Tigres signing Andre-Pierre Gignac. The French..查看文章
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