The High-Flying, Death-Defying Discovery of Helium | Science History Institute
Pierre Jules Cesar Janssen ( February 1824- December 1907), also know as Jules Janssen, was a French astronomer “who will always rank as one of the most eminent scientific men of his country” ( click on PDF sign at the top of the name link to read in full).
The balloons released during the siege of Paris.
M.G. Mangin, Aéronaute, Public domain, via Wikimedia Commons
Thumbnail Image: false-color ultraviolet image of the Sun taken on August 1, 2010.
“On August 1, 2010, almost the entire Earth-facing side of the sun erupted in a tumult of activity. This image from the Solar Dynamics Observatory of the news-making solar event on August 1 shows the C3-class solar flare (white area on upper left), a solar tsunami (wave-like structure, upper right), multiple filaments of magnetism lifting off the stellar surface, large-scale shaking of the solar corona, radio bursts, a coronal mass ejection and more.” Source NASA Image of the Day