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Hace 3 días · Due to their great distance from the Earth, all stars except the Sun appear to the unaided eye as shining points in the night sky that twinkle because of the effect of the Earth's atmosphere. The Sun is close enough to the Earth to appear as a disk instead, and to provide daylight.
Hace 4 días · Stefani and his colleagues have been investigating this potential link for some time, and now they believe they've found new evidence in its favor: giant vortical waves in the Sun called Rossby waves, only recently detected for the first time, similar to the Rossby waves on Earth that drive the atmospheric pressure system.
Hace 17 horas · Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars.Their mass is approximately 13 to 80 times that of Jupiter (M J) —not big enough to sustain nuclear fusion of ordinary hydrogen (1 H) into helium in their cores, but massive enough to emit some light and heat from the fusion of deuterium (2 H).
Hace 1 día · Far in the future, when hydrogen fusion in the Sun's core diminishes to the point where the Sun is no longer in hydrostatic equilibrium, its core will undergo a marked increase in density and temperature which will cause its outer layers to expand, eventually transforming the Sun into a red giant.
Hace 5 días · You might think, “Sounds about right,” but here’s the catch: a detached individual often skips this critical step of connecting the dots between who they are, what they care about, and the idea they aim to acquire. They jump directly to the second layer — the ... Why does the sun go on shining? amitaycohen.substack.com.
Hace 5 días · The small part of this energy intercepted by Earth (the solar constant, on average 1.4 kilowatts per square metre) is of enormous importance to life and to the maintenance of natural processes on Earth’s surface (see also sunlight).
Hace 4 días · solar nebula, gaseous cloud from which, in the so-called nebular hypothesis of the origin of the solar system, the Sun and planets formed by condensation. Swedish philosopher Emanuel Swedenborg in 1734 proposed that the planets formed out of a nebular crust that had surrounded the Sun and then broken apart. In 1755 the German philosopher Immanuel Kant suggested that a nebula in slow rotation ...
