The center of the Milky Way lies in the direction of the constellation
A) Cygnus. B) Orion. C) Andromeda. D) Sagittarius. E) Virgo.
D
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The _______________ formula expresses the relationship of the linear (true) diameter, the angular (apparent) diameter, and the distance, of any object
Fill in the blank(s) with correct word
What kind of observations can astronomers use to study Io's volcanoes?
A) spectroscopy to determine the composition of the plumes B) infrared images to study warm plumes on Io's night-side C) visible-light images to study the distribution of sulfur compounds on its surface D) visible-light images to study plumes using reflected sunlight E) all of the above
For three identical lamps in parallel with a 1.5-volt dry cell, the voltage across the lower lamp is
1) 1/2 V. 2) 1 V. 3) 1.5 V. 4) 3 V. If that lamp is disconnected, the other two lamps will 5) glow the same. 6) glow much more brightly. 7) glow much more dimly.
The proton-proton chain needs high temperature because
a. of the ground state energy of the hydrogen atom. b. of the presence of helium atoms. c. the protons must overcome the Coulomb barrier. d. of the need for low density. e. the neutrinos carry more energy away than the reaction produces.