By Ian Ridpath
Astronomy is increasing virtually as speedily because the universe itself, and the proliferating medical jargon can occasionally baffle even the main devoted beginner. Now, in a few 4,000 concise, updated entries, this dictionary cuts a transparent direction in the course of the maze of advanced technical language, delivering complete, transparent definitions drawn from all elements of astronomy. Compiled through Ian Ridpath, a fellow of the Royal Astronomical Society, and knowledgeable crew of members, A Dictionary of Astronomy comprises the newest entries from astrophysics and cosmology to galaxies and time.Here are succinct definitions for the massive Bang thought, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, area missions, and lately named sun approach items convey how astronomers have explored the universe. The Dictionary additionally presents biographical entries on eminent astronomers from Copernicus to Edwin Hubble.From black gap to white dwarf, and from spiral galaxies to sunlight waves, A Dictionary of Astronomy opens a window at the universe for beginner astronomers all over the place.
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Extra resources for Dictionary of Astrononmy (1998)(1st ed.)(en)(532s)
Ambipolar diffusion The process by which a gas cloud that is collapsing to form stars can detach itself from the interstellar magnetic field, so avoiding the build-up of magnetic pressure which would otherwise halt the collapse. During a slow collapse the neutral atoms and molecules can slip past the magnetic field lines in the gas. In this way the bulk of the cloud collapses but does not take the magnetic field all the way with it. AM Canum Venaticorum star A rare form of cataclysmic binary that appears to consist of a pair of white dwarfs.
ALEXIS A small US Department of Defense satellite carrying four telescopes to map the soft X-ray and extreme ultraviolet background over the whole sky. ALEXIS (Array of Low-Energy X-ray Imaging Sensors) was launched in 1993 April. Alfvén, Hannes Olof Gösta (1908–95) Swedish physicist. In the 1930s he developed a theory of sunspot formation based on the idea that under certain conditions a magnetic field can be 'frozen in' to a plasma. In 1942 he proposed that waves (now called *Alfvén waves) can propagate through a plasma under conditions similar to those found in the Sun's atmosphere.