Newtons theroy Essay

The newtons theroy of it must be trueDuring the first half of the 19th hundred years, scientists such as John Herschel, Fox Talbot, and Bill Swan researched the spectra of different chemical elements in flames. Gradually, the idea that every element produces a set of characteristic emission lines was established. Each element provides several visible, and many reduced, emission lines in a feature pattern. Sodium, for example , provides two prominent yellow lines (the apparent D lines) at 589. 0 and 589. six nm -- any test that contains sodium (such since table salt) can be easily recognized applying this pair of lines. One of the most remarkable triumphs of astrophysical spectroscopy during the 19th century was the discovery of helium. An emission collection at 587. 6 nm was first observed in the solar corona through the eclipse of August 18, 1868, even though the precise wavelength was difficult to establish at the time (due to the short remark using short-term set-ups of instruments carried to Asia). Two months afterwards, Norman Lockyer used a smart technique and managed to notice solar prominences without waiting pertaining to an eclipse. He known the precise wavelength (587. 6 nm) on this line, and saw that no regarded terrestrial factors had a series at this wavelength. He figured this must be a newly discovered component and referred to as it 'helium'. Helium was discovered on Earth eventually (1895) and showed the same 587. 6 nm line. Today, we know that helium is the second most numerous element in the Universe.

All of us also understand today that the most abundant aspect is hydrogen. However , this fact has not been obvious initially. Many years of the two observational and theoretical functions culminated in 1925, once Cecilia Payne published her PhD thesis entitled 'Stellar Atmospheres'. (Footnote: this was the first ever PhD awarded for Harvard; it had been also lauded as " undoubtedly one of the most brilliant PhD thesis at any time written in astronomy" practically 40 years later on. She later on turned to studies of variable stars, and...



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