What evidence supports the theory that elliptical galaxies come from denser clouds?
A) Elliptical galaxies are denser than spiral galaxies.
B) Elliptical galaxies are generally larger than spiral galaxies.
C) Elliptical galaxies at high redshifts lack young, blue stars.
D) Elliptical galaxies have more gas than spiral galaxies.
E) Elliptical galaxies have denser stars than spiral galaxies.
C
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The Almagest
a. is the book that first described the heliocentric solar system. b. is a collection of the science and mathematics of the Greeks. c. caused the author to be sentenced to house arrest. d. is a book of astrological myths and predictions produced by the Arabs. e. first described the Copernican theory.
Astronomers believe that most of the matter that makes up the universe is not detected by any part of the electromagnetic spectrum. This mysterious matter is called ______________
Fill in the blank(s) with correct word
A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 20°C, heat is transferred at a rate of 32 J/s. The bar is then stretched uniformly to twice its original length. If again it has ends at 100°C and 20°C, at what rate will heat be transferred between it ends?
a. 4 J/s c. 16 J/s b. 8 J/s d. 32 J/s
The objective lens of a refracting astronomical telescope has a focal length of 60 cm, and the eyepiece has a focal length of 2.0 cm. How far apart should the lenses be placed in order to form a final image at infinity?
A) 60 cm B) 58 cm C) 76 cm D) 44 cm E) 62 cm