United States or Syria ? Vote for the TOP Country of the Week !
The new lines, accordingly, filled places in a manner already prepared for them, and were thus unmistakably associated with the hydrogen-spectrum. This is now known to be represented in prominences by twenty-seven lines, forming a kind of harmonic progression, only four of which are visibly darkened in the Fraunhofer spectrum of the sun. The chemistry of "cloud-prominences" is simple.
Its natural and obvious character was shown by its having struck several observers independently. The distinction of "cloud-prominences" from "flame-prominences" was announced by Lockyer, April 27; by Zöllner, June 2; and by Respighi, December 4, 1870. The first description are tranquil and relatively permanent, sometimes enduring without striking change for many days.
Word Of The Day