Stellar Alchemy: The Celestial Origin of Atoms by Michel Cassé

By Michel Cassé

Why do the celebrities shine? What messages do we learn within the mild they ship to us from the depths of the evening? Nuclear astrophysics is an engaging self-discipline, and allows connections to be made among atoms, stars, and humans. via glossy astronomy, scientists have controlled to resolve the total historical past of the chemical components, and know how they originated and advanced into the entire parts that compose our environment at the present time. The transformation of metals into gold, anything as soon as dreamed of by way of alchemists, is a approach normally happening within the cores of huge stars. however the most enjoyable revelation is the intimate connection that humanity has with the particles of exploded stars. Stellar Alchemy is a fascinating account of nucleosynthesis in stars, and the linked chemical evolution of the Universe, that's appropriate for the overall reader. Michel Cassé is an astrophysicist and the writer of numerous books (in French) of astronomy for most people.

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In fact, blue = 50 000 degrees. Blue means hot, we might say ‘blue-hot’. Any object heated to a certain temperature emits radiation known paradoxically as blackbody radiation, regardless of its shape and composition. The wavelength at which this radiation reaches a maximum is inversely proportional to the temperature of the emitting object. The hotter the body, the shorter the emitted 22 Visions wavelengths. The relevant relation between energy and temperature is energy = Boltzmann’s constant × temperature.

There is unity of substance, but also unity of law. Gravity and electromagnetism, and all other laws of physics, are valid down here and up there, on the Moon, in the Sun and quasars, and throughout the whole observable Universe. Chemical analysis through light emissions allows us to determine the relative abundances of the various elements in the atmosphere of any star or cloud, and this over the whole range of photon energies. Indeed, spectroscopy has gradually been extended to cover a large part of the electromagnetic spectrum, on either side of the visible.

There is no choice therefore but to break out from the cocoon, to rise above the atmosphere by means of stratospheric balloons, rockets and satellites. With its airborne and space-borne telescopes, the whole planet Earth is turned towards the Universe, its eye emerging from the air like a bather from the sea. However, the sky is Telescopes in the sky, on the ground and in the basement 41 not the only arena of modern astronomy. Telescopes are also flourishing in the basement and continue to prosper on high mountain tops.

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