Send the following on WhatsApp
Continue to ChatIt may well be said that the answer to the question: Of what do the cosmic rays in fact consist before they produce their familiar secondary radiation phenomena in the earth's atmosphere? can only be obtained from numerous measurements in the stratosphere. - Victor Francis Hess from https://whatsmyquote.com/quote/it-may-well-be-said-that-the-answer-to-the-question-of-what-do-the-cosmic-rays-in-fact-consist-before-they