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In astronomy or planetary science, the frost line, also known as the snow line or ice line, is the minimum distance from the central protostar of a solar nebula where the temperature is low enough for volatile compounds such as water, ammonia, methane, carbon dioxide and carbon monoxide to condense into solid grains, which will allow their accretion into planetesimals.
"Birches" is a poem by American poet Robert Frost. First published in the August 1915 issue of The Atlantic Monthly together with "The Road Not Taken" and "The Sound of Trees" as "A Group of Poems". It was included in Frost's third collection of poetry Mountain Interval, which was published in 1916.
Planetesimals beyond the frost line accumulated up to 4 M E within about 3 million years. [38] Today, the four giant planets comprise just under 99% of all the mass orbiting the Sun. [b] Theorists believe it is no accident that Jupiter lies just beyond the frost line. Because the frost line accumulated large amounts of water via evaporation ...
As it was being published, Frost met with fellow writer Ezra Pound, who insisted they immediately go to Nutt to see a copy of the book in print. Pound offered to write a review that day and soon introduced Frost to poet William Butler Yeats. [5]: 127–8 Yeats said he considered A Boy's Will "the best poetry written in America in a long time."
In geology, the frost line is the level down to which the soil will normally freeze each winter. By an analogy, the term is introduced in other areas. Frost line (astrophysics), a particular distance in the solar nebula from the central protosun where it is cool enough for hydrogen compounds such as water, ammonia, and methane to condense into solid ice grains.
Thus, the Sun occupies 0.00001% (1 part in 10 7) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly 1 millionth (10 −6) that of the Sun. Jupiter, the largest planet, is 5.2 AU from the Sun and has a radius of 71,000 km (0.00047 AU; 44,000 mi), whereas the most distant planet, Neptune, is 30 AU ...
The Titans are a pantheon of gods who ruled prior to the Olympians and are now destined to fall. They include Saturn (king of the gods), Ops (Saturn's wife), Thea (Hyperion's sister), Enceladus (cast as the god of war, though considered a Giant rather than a Titan in Greek mythology), Oceanus (god of the sea), Hyperion (the god of the sun) and Clymene (a young goddess).
The sun makes the mountains look beautiful, and the meadows and streams are glittering in a way that only heavenly magic can do. In the second line, Kathryn Duncan-Jones points out the reversal of the traditions of courtly love roles suggested most often. Courtiers flatter the sovereigns, but this sovereign, a sun/son, flatters (deceives ...