By Norman K Glendenning
In an excellent flash approximately fourteen billion years in the past, time and topic have been born in one rapid of production. An immensely scorching and dense universe started its swift enlargement in every single place, growing area the place there has been no house and time the place there has been no time. within the severe hearth simply after the start, the lightest parts have been solid, later to shape primordial clouds that finally developed into galaxies, stars, and planets. This evolution is the tale informed during this interesting ebook. Interwoven with the storyline are brief items at the pioneering women and men who printed these wonders to us.
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Extra resources for After The Beginning: A Cosmic Journey Through Space And Time
Only when the color was changed to one of a higher frequency (greater energy) did the electron energy increase. Einstein realized t h a t all of this showed t h a t the b e a m of light was behaving like a beam of particles by knocking electrons from the metal surface and, moreover, t h a t a certain minimum energy was needed because each electron was held to the metal by the attractive electric force exerted by the protons in atoms of the metal. This phenomenon is called the photoelectric effect.
Island Universes 17 Fig. 10. The Southern Ring (NGC3132), a planetary nebula, is the remains of a star of about our Sun's mass, which, near the end of its life, expands into a very much larger and bloated red giant. A similar fate awaits our Sun in about seven billion years. The red giant expels hot gasses from its surface at velocities of tens of kilometers a second, and these hot ionized gasses are what is seen as the planetary nebula. It will dissipate and disappear into interstellar space after some 10 000 years.
However, light has some particlelike properties and particles have some wavelike properties. One way in which the particulate nature of light shows up is by the fact t h a t its energy is carried in small bundles, the so-called quantum of energy. T h e energy carried by the q u a n t a of light of one particular color is different from t h a t carried by the q u a n t a of another color. There is a continuous range of energy t h a t light q u a n t a can carry, but each corresponds to a different hue.