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Chapter14- Our Galaxy - SFA Physics and Astronomy
Chapter14- Our Galaxy - SFA Physics and Astronomy

... One of these novae, however, turned out to be a Cepheid variable, a star that changes predictably in brightness ...
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... falling from long distances must have attained high velocities before colliding and absorbed in the envelope of the forming body. Such a collision should result not only in vaporization but ionisation also to some extent. I n the initial stages, therefore, the envelope might contain some plasma as d ...
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... These cliffs may have formed at a time when Mercury apparently shrank in diameter, as seen in Figure 4. Why would Mercury have shrunk? Mariner 10 detected a weak magnetic field around Mercury. This indicates that the planet has an iron core. Some scientists hypothesize that the crust of Mercury soli ...
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Formation and evolution of the Solar System



The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.The Solar System has evolved considerably since its initial formation. Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later been captured by their planets. Still others, such as the Moon, may be the result of giant collisions. Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System. The positions of the planets often shifted due to gravitational interactions. This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.In roughly 5 billion years, the Sun will cool and expand outward many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the far distant future, the gravity of passing stars will gradually reduce the Sun's retinue of planets. Some planets will be destroyed, others ejected into interstellar space. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it.
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