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By Sir John Frederick William Herschel
This Elibron Classics e-book is a facsimile reprint of a 1833 version by way of Longman, Rees, Orme, Brown, eco-friendly, & Longmans; and John Taylor, London. the cupboard Cyclopaedia.
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Extra info for A treatise on astronomy
The blue and green stars higher frequencies. are hotter than the sun, while the brightAstronomers know red stars are red giants, which are much cooler stars near the end of their lives. the normal spectrumThe sun will eventually become a red line frequencies for many giant. The Hubble Heritage Team chemicals. By comparing (AURA/STScI/NASA) these known frequencies with those of the same set of lines in a star’s spectrum, astronomers can tell how fast the star is moving toward or away from Earth.
40 The Solar System Except for Venus and Uranus, each planet rotates on its axis in a west-to-east motion. In most cases the spin axis is nearly at a right angle to the plane of the planet’s orbit. Uranus, however, is tilted so that its spin axis lies almost in its plane of orbit. For some 75 years astronomers considered Pluto to be the solar system’s ninth planet. This tiny distant body was found to be unusual for a planet, however, in its orbit, composition, size, and other properties. 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.
While it might be simpler to leave it out (by assigning it a value of zero), Einstein assigned it a positive value so that the universe would be essentially unchanging, as he expected. S. astronomer Edwin Hubble announced an amazing discovery— evidence that the universe actually is expanding. In the mid-1920s astronomers had found that a class of cloudlike objects, then called spiral nebulae, are actually huge, 51 Astronomy: Understanding the Universe distant groups of billions of stars, now called galaxies.
A treatise on astronomy by Sir John Frederick William Herschel