The Complete Aquarium Guide

The Complete Aquarium Guide

[...]... foundation for Einstein's theory Two bodies with mass attract each other Whichever body has the greatest mass will exert a greater force on the other The greater the distance between the objects, the smaller the force they exert on each other F m1 m2 d F=G x m1 x m2 d2 Strong Nuclear Force Real position The strong nuclear force holds the protons and neutrons of atomic nuclei together Both protons and neutrons... those parts' distances from the core of the galaxy The greatest number of stars is and the center of the Milky Way, holds one of the most luminous stars in the galaxy, concentrated in the region between the Milky Way's Eta Carinae The Perseus arm, the main outer arm of the Milky Way, contains young core and its border Here the speed of rotation is much stars and nebulae The Orion arm, extending between... GRAVITY The gravitational pull of the Sun upon the planets not only keeps them inside the solar system but also influences the speed with which they revolve in their orbits around the Sun Those closest to the Sun revolve in their orbits much faster than those farther from it 42 THE SOLAR SYSTEM UNIVERSE 43 A Very Warm Heart Surface and Atmosphere T he Sun at the center of the solar system is a source of... activity in the center of our galaxy and contain the heart of the Milky Way within their depths In general, the stars in this region are cold and range in color from red to orange SAGITTARIUS B2 The largest dark cloud in the central region of the Milky Way, Sagittarius B2 contains enough alcohol to cover the entire Earth HOT GASES The hot gases originating from the surface of the central region may be the. .. reach the star's surface They can be detected on the surface of red giants WHITE DWARF After the nuclear reaction in the star's core ceases, the star ejects its outer layers, which then form a planetary nebula Convection Cells Convection cells carry heat toward the surface of a star The ascending currents of gas eventually reach the surface of the star, carrying with them a few elements that formed in the. .. 650 light-years from the Earth and is located in the constellation Aquarius White Dwarf The remains of the red giant, in which the fusion of carbon and oxygen has ceased, lie at the center of the nebula The star slowly cools and fades MYCN 18 IC 418 The two rings of colored gas form the silhouette of this hourglass-shaped nebula The red in the photograph corresponds to nitrogen, and the green corresponds... after the big bang Billions of these great conglomerates of stars can be found throughout space The two most important discoveries concerning galaxies are attributed to the astronomer Edwin Hubble In 1926, he pointed out that the spots, or patches, of light visible in the COLLISION 300 million light-years from the Earth, these two colliding galaxies form a pair Together they are called The Mice” for the. .. galaxies, possibly including the Milky Way, were formed from the gradual calming of a quasar at their core As the surrounding gases consolidated in the formation of stars, the quasars, having no more gases to absorb, lost their energetic QUASARS The most powerful objects in the universe, quasars are so distant from Earth that they appear to us as diffuse stars They are the bright cores of remote galaxies... form The outer layer of the star may extend across several light-years of interstellar space Jupiter's orbit Saturn's orbit REGION OF THE CORE 1 HYDROGEN undergoing Hydrogen continues SPECTACULAR DIMENSIONS On leaving the main sequence, the star enlarges to 200 times the size of the Sun When the star begins to burn helium, its size decreases to between 10 and 100 times the size of the Sun The star then... black hole, travel through space to other universes might be possible because of antigravitational effects The most accepted theory about the future of the cosmos says that the universe possesses a mass smaller than the critical value The latest measurements seem to indicate that the present time is just a phase before the death of the universe, in which it goes completely dark 4 Inflection point New . each other. Whichever body has the greatest mass will exert a greater force on the other. The greater the distance between the objects, the smaller the force. nothing, the universe began to exist. According to the big bang theory the theory most widely accepted in the scientific community—in the beginning, there appeared