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As astronomers began to explore the physical nature of comets, they found that meteors came from dust left by comets. Major meteor showers such as the Leonids, seen here as they appeared on November 12, 1799, occurred as Earth plowed through a river of comet dust. In 1833 and in 1866 additional recurrences of a Leonid meteor 'storm' helped lead to the discovery of the parent comet from which meteors came. (From the Midnight Sky, by Edwin Dunkin, 1869).
As astronomers began to explore the physical nature of comets, they found that meteors came from dust left by comets. Major meteor showers such as the Leonids, seen here as they appeared on November 12, 1799, occurred as Earth plowed through a river of comet dust. In 1833 and in 1866 additional recurrences of a Leonid meteor 'storm' helped lead to the discovery of the parent comet from which meteors came. (From the Midnight Sky, by Edwin Dunkin, 1869).
As astronomers began to explore the physical nature of comets, they found that meteors came from dust left by comets. Major meteor showers such as the Leonids, seen here as they appeared on November 12, 1799, occurred as Earth plowed through a river of comet dust. In 1833 and in 1866 additional recurrences of a Leonid meteor 'storm' helped lead to the discovery of the parent comet from which meteors came. (From the Midnight Sky, by Edwin Dunkin, 1869).
Comets universally foretold disasters and misfortune until the start of the scientific revolution. For example, public fears linked the Great Comet of 1556, shown in a woodcut from a German pamphlet, with earthquakes in that same year. Another century and more would pass before the growth of mathematical astronomy could seriously challenge credulous views of comets.
Comets universally foretold disasters and misfortune until the start of the scientific revolution. For example, public fears linked the Great Comet of 1556, shown in a woodcut from a German pamphlet, with earthquakes in that same year. Another century and more would pass before the growth of mathematical astronomy could seriously challenge credulous views of comets.
As astronomers began to explore the physical nature of comets, they found that meteors came from dust left by comets. Major meteor showers such as the Leonids, seen here as they appeared on November 12, 1799, occurred as Earth plowed through a river of comet dust. In 1833 and in 1866 additional recurrences of a Leonid meteor 'storm' helped lead to the discovery of the parent comet from which meteors came. (From the Midnight Sky, by Edwin Dunkin, 1869)..
Comets universally foretold disasters and misfortune until the start of the scientific revolution. For example, public fears linked the Great Comet of 1556, shown in a woodcut from a German pamphlet, with earthquakes in that same year. Another century and more would pass before the growth of mathematical astronomy could seriously challenge credulous views of comets.
Plant cell structure. Artwork of a sectioned plant cell. The features that distinguish a plant cell from an animal cell are the cell wall and the chloroplasts . The large central vacuole also contrasts with the many small vacuoles of an animal cell. Chloroplasts contain a pigment, chlorophyll, which is used in photosynthesis. The nucleus has been cut open to show the nucleolus (sphere), and is found in plant and animal cells, as are the energy-producing mitochondria and peroxisomes.