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Quote by Edwin Powell Hubble

“The great spirals, with their enormous radial velocities and insensible proper motions, apparently lie outside our Solar system.”

Quote by Edwin Powell Hubble

Book:Photographic Investigations of Faint Nebulae ...

Work

Photographic Investigations of Faint Nebulae ...

Photographic Investigations of Faint Nebulae ... delves into the use of photography as a tool for observing and analyzing faint nebulae in the cosmos. It provides a comprehensive look at the techniques and methodologies employed in capturing these celestial bodies, as well as the scientific findings and interpretations derived from these observations. more

Author

Edwin Powell Hubble

Edwin Powell Hubble was an American astronomer known for his significant contributions to observational cosmology and extragalactic astronomy. His discovery in 1929 that the universe is expanding was a major breakthrough, leading to the acceptance of the Big Bang theory. Hubble's work also provided evidence for the existence of galaxies beyond the Milky Way and helped establish Hubble's Law. more

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“The outstanding feature, however, is the possibility that the velocity-distance relation may represent the de Sitter effect, and hence that numerical data may be introduced into discussions of the general curvature of space.”

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Book:Hubble's Cosmology: A Guided Study of Selected Texts

Source: Hubble's Cosmology: A Guided Study of Selected Texts

“On the left-hand side of the field equation we may add the fundamental tensor guv, multiplied by a universal constant, -λ, at present unknown, without destroying the general covariance.”

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“Since I have introduced this term I had always a bad conscience. . . . I cannot help to feel it strongly and I am unable to believe that such an ugly thing should be realized in nature.”

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“On scientific grounds this big bang assumption is much less the palatable of the two. For it is an irrational process that cannot be described in scientific terms. . . . On philosophical grounds too I cannot see any good reason for preferring the big bang idea. Indeed it seems to me in the philosophical sense to be a distinctly unsatisfactory notion, since it puts the basic assumption out of sight where it can never be challenged by a direct appeal to observation.”

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Book:The nature of the universe

Source: The nature of the universe

“When all thermonuclear sources of energy are exhausted a sufficiently heavy star will collapse. Unless fission due to rotation, the radiation of mass, or the blowing off of mass by radiation, reduce the star's mass to the order of that of the sun, this contraction will continue indefinitely.”

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“There are no black holes - in the sense of regimes from which light can't escape to infinity. There are however apparent horizons which persist for a period of time.”

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“There are reasons, increasing in number and quality, to believe that the masses of ordinary galaxies may have been underestimated by a factor of 10 or more.”

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“Cosmology is serious business and in our hearts we are nothing if not cosmologists, hanging in a cold cage sifting the ruthless jewels of existence.”

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“Astronomy, as nothing else can do, teaches men humility.”

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Book:Report on Planet Three

Source: Report on Planet Three

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Book:Carl Sagan: a life

Source: Carl Sagan: a life