A popular handbook and atlas of astronomy, designed as a complete guide to a knowledge of the heavenly bodies and as an aid to those possessing telescopes (1891)
Peck, William, Sir, 1862-1925 · New York, G. P. Putnam's Sons · leaf 122
6,000 times greater than that of the sun in our tropical regions,or over 2000 times greater than the temperature of red-hot iron. Under the action of the solar heatthe nucleus appears to decrease, a result which would not be expected, as the effect of an increase of tempera-ture is rather to expand… … COMETS AND METEORS. 67 it be made more transparent, the apparent size of the head will be less. The appearance of the brightest partof the head alters also with increase of telescopic power; for the larger the instrument employed, the smallerit appears; this indicates that even in a large comet the…
Astronomy
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