Download e-book for kindle: Astronomy: Understanding the Universe by Sherman Hollar

By Sherman Hollar

ISBN-10: 1615305696

ISBN-13: 9781615305698

Fathoming the boundlessness of area and the universe, we're instantly full of interest approximately our personal origins and beauty concerning the items, existence types, and topic that populate the cosmos. in the course of the observations and paintings of astronomers over the years, we've got slowly been capable of lessen the variety of unknowns and enhance causes or theories for a few of the celestial gadgets and phenomena we see. This space-traveling survey recounts a few of the significant discovery milestones within the box of astronomy and examines the instruments and methods at the moment utilized by astronomers to review the universe.

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Extra info for Astronomy: Understanding the Universe

Sample text

The cloud may have been produced long ago, as icy bodies near and inside Neptune’s orbit were thrown far out from the Sun by gravitational encounters with the outer planets. Does Life Exist Elsewhere? Life as we know it, particularly in its higher forms, can exist only under certain chemical and physical conditions. The requirements for life are not fully known, but they almost surely include a reasonable temperature range, so that chemical bonding can occur, and a source of energy, such as sunlight or heat coming from the interior of a planet.

Created by the space-bound Hubble Telescope, it reveals galaxies from the time shortly after the big bang. NASA/Getty Images 54 The Universe With this in mind, the redshift can be considered as the effect of space having stretched since the light was emitted. Light emitted when the universe was half its current size, for example, would now be seen to have twice the original wavelength. The Uniform Universe The distribution of the galaxies Hubble studied also provided evidence of the cosmological principle—two important properties that the universe is assumed to have.

In the late 20th century astronomers discovered a group of numerous small icy bodies that orbit the Sun from beyond Neptune in a nearly flat ring called the Kuiper belt. Many of Pluto’s characteristics seem similar to those of Kuiper belt objects. Several of those objects are roughly the same size as Pluto, and one, named Eris, is known to be larger. In 2006 the International Astronomical Union, the organization that approves the names of celestial objects, removed Pluto from the list of planets.

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Astronomy: Understanding the Universe by Sherman Hollar

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