Frasi di William Herschel

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William Herschel

Data di nascita: 15. Novembre 1738
Data di morte: 25. Agosto 1822

Pubblicità

Sir Frederick William Herschel è stato un astronomo, fisico e compositore britannico di origine tedesca.

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Frasi William Herschel

„Ho osservato stelle la cui luce, come si può dimostrare, deve impiegare 2 milioni di anni per raggiungere la Terra.“

—  William Herschel
citato in AA.VV., Il libro dell'astronomia, traduzione di Roberto Sorgo, Gribaudo, 2017, p. 89. ISBN 9788858018347

Pubblicità

„This consideration must alter the form of our proposed inquiry; for the question being thus at least partly decided, since it is ascertained that we have rays of heat which give no light, it can only become a subject of inquiry whether some of these heat-making rays may not have a power of rendering objects visible, superadded to their now already established power of heating bodies.“

—  William Herschel
This being the case, it is evident that the onus probandi [burden of proof] ought to lie with those who are willing to establish such an hypothesis, for it does not appear that Nature is in the habit of using one and the same mechanism with any two of our senses. Witness the vibration of air that makes sound, the effluvia that occasion smells, the particles that produce taste, the resistance or repulsive powers that affect the touch—all these are evidently suited to their respective organs of sense. Ch.4 "Life and Works" on his discovery of the infrared.

„We may conceive that, perhaps in progress of time these nebulæ which are already in such a state of compression, may be still farther condensed so as actually to become stars.“

—  William Herschel
Astronomical Observations relating to the Construction of the Heavens... (1811), Context: We may conceive that, perhaps in progress of time these nebulæ which are already in such a state of compression, may be still farther condensed so as actually to become stars.<!-- p. 318

„It is very probable that the great stratum called the Milky Way is that in which the sun is placed, though perhaps not in the very centre of its thickness.“

—  William Herschel
Context: It is very probable that the great stratum called the Milky Way is that in which the sun is placed, though perhaps not in the very centre of its thickness.... We gather this from the appearance of the Galaxy, which seems to encompass the whole heavens, as it certainly must do if the sun is within it.<!-- p. 159-160 Ch.4 "Life and Works".

„This tends to confirm the hypothesis that all are composed of stars more or less remote.“

—  William Herschel
Context: Nebulæ can be selected so that an insensible gradation shall take place from a coarse cluster like the Pleiades down to a milky nebulosity like that in Orion, every intermediate step being represented. This tends to confirm the hypothesis that all are composed of stars more or less remote. Ch.4 "Life and Works"

„An object may not only contain stars, but also nebulosity not composed of them.“

—  William Herschel
Astronomical Observations relating to the Construction of the Heavens... (1811), Context: An object may not only contain stars, but also nebulosity not composed of them.<!-- p. 270

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„It will be necessary to explain the spirit of the method of arranging the observed astronomical objects under consideration in such a manner, that one shall assist us to understand the nature and construction of the other.“

—  William Herschel
Astronomical Observations relating to the Construction of the Heavens... (1811), Context: It will be necessary to explain the spirit of the method of arranging the observed astronomical objects under consideration in such a manner, that one shall assist us to understand the nature and construction of the other. This end I propose to obtain by assorting them into as many classes as will be required to produce the most gradual affinity... and it will be found that those contained in one article, are so closely allied to those in the next, that there is perhaps not so much difference between them... as there would be in an annual description of the human figure were it given from the birth of a child till he comes to be a man in his prime.<!-- p. 270-271

„The starlike appearance of the following six nebulæ is so considerable that the best description… was to compare them to stars with certain deficiencies.“

—  William Herschel
Astronomical Observations relating to the Construction of the Heavens... (1811), Context: The starlike appearance of the following six nebulæ is so considerable that the best description... was to compare them to stars with certain deficiencies.<!-- p. 328

„It is evident that we cannot mean to affirm that the stars of the fifth, sixth, and seventh magnitudes are really smaller than those of the first, second, or third, and that we must ascribe the cause of the difference in the apparent magnitudes of the stars to a difference in their relative distances from us.“

—  William Herschel
Context: It is evident that we cannot mean to affirm that the stars of the fifth, sixth, and seventh magnitudes are really smaller than those of the first, second, or third, and that we must ascribe the cause of the difference in the apparent magnitudes of the stars to a difference in their relative distances from us. On account of the great number of stars in each class, we must also allow that the stars of each succeeding magnitude, beginning with the first, are, one with another, further from us than those of the magnitude immediately preceding. Ch.4 "Life and Works" from a memoir, published (1817).

„Nebulæ can be selected so that an insensible gradation shall take place“

—  William Herschel
Context: Nebulæ can be selected so that an insensible gradation shall take place from a coarse cluster like the Pleiades down to a milky nebulosity like that in Orion, every intermediate step being represented. This tends to confirm the hypothesis that all are composed of stars more or less remote. Ch.4 "Life and Works"

„Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam egestas wisi a erat. Morbi imperdiet, mauris ac auctor dictum.“

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