The Stars. The Definitive Visual Guide to the Cosmos by DK

By DK

The definitive visible advisor to exploring all of the marvels of the celebrities, the Milky manner, and the universe beyond.
Chart the wonders of the cosmos in our personal sunlight approach and past with the celebrities. choked with 3D artistic endeavors of every constellation and marvelous new imagery from the Hubble area Telescope, ground-based observatories all over the world, and extra, this awe-inspiring consultant good points the main attention-grabbing items identified to astronomy, from glittering star-birth nebulae to supermassive black holes.
The place, dimension, and colour of each night-sky item is printed with exceptional readability, and a in particular commissioned 3-D version of the celestial sphere that surrounds our planet charts all 88 constellations, jointly forming an entire map of the sky. From the massive Bang to the hunt for extraterrestrial lifestyles, key parts in astronomy and cosmology are lined, and colourful infographics distill a wealth of information into an easy-to-digest visible structure.

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The Stars. The Definitive Visual Guide to the Cosmos

The definitive visible advisor to exploring the entire marvels of the celebs, the Milky approach, and the universe past. Chart the wonders of the cosmos in our personal sunlight procedure and past with the celebs. jam-packed with three-D works of art of every constellation and awesome new imagery from the Hubble house Telescope, ground-based observatories all over the world, and extra, this awe-inspiring advisor positive factors the main attention-grabbing gadgets recognized to astronomy, from glittering star-birth nebulae to supermassive black holes.

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Spiral arms Astronomers have recently confirmed that the Milky Way is a barred spiral galaxy. Its central hub is crossed by a rectangular bar of stars some 27,000 light-years in length. Our galaxy’s spiral arms are the result of stars, gas, and dust moving in and out of a spiral-shaped “traffic jam” called a density wave (see opposite). The latest evidence suggests that the Milky Way has four spiral arms—two major and two minor—with distinct differences among their stars Globular clusters Thick disk Central bulge Halo High velocity star Thin disk Heart of the Milky Way The central regions of our galaxy are hidden behind intervening star clouds and dust lanes, but X-rays and infrared can pierce the veil to reveal complex structures, giant star clusters, and an enormous black hole with the mass of several million Suns (embedded in the bright gas cloud to right of the image).

The energy-producing fusion reactions are sensitive to changes in temperature and pressure, so tiny variations in these can cause instability in the star’s size, leading to large-scale pulsations. Star alternately expands and contracts Gas in outer layers escapes or is pushed away 3 Star loses material from outer layers At the extremes of each pulsation, the red giant expands at such a speed that gas in its outer layers can escape the star’s gravity altogether, billowing out into space. The gas is also pushed away by the pressure exerted by particles and photons (tiny packets of light) blasted out from the star’s hot core.

Nearly all other, heavier, elements—such as carbon and oxygen—have been made since then, in stars or in supernova explosions. Through the formation, evolution, and deaths of stars, these heavier elements have gradually become more abundant in the cosmos. ” Young stars tend to have the highest metallicities, as they contain materials that have already been recycled through several star generations. Neutron star Supernova remnant At the center of a planetary nebula is the remnant of the red giant’s core: a small, bright star called a white dwarf Gas and other matter ejected by stars during their lifetimes Material from stars joins with interstellar material to form huge clouds of gas and dust In time, it is expected that a white dwarf will fade and dim, becoming a cold, dead star known as a black dwarf Stars shed material White dwarf Black dwarf ◁ The lives of stars Contrasted here are the life stories of three main categories of stars: (from top) high-mass stars, medium-mass (Sun-sized) stars, and low-mass stars.

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