If star A is 14.5 times brighter than star B, then what is their magnitude difference?
a. 1.2
b. 2.9
c. 63.1
d. 800
e. 6.2 x 10^5
b
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The lowest mass object that can initiate thermonuclear fusion of hydrogen has a mass of about
a. 1 solar masses b. 80 solar masses c. 8 solar masses d. 0.08 solar masses e. 0.001 solar masses
Use figure E2.12 to specify the direction of the net force that the neutral atom exerts on the dipole. (Hint: Think of any dipole(s) as independent charged particles.
A. A B. B C. C D. D E. Zero F. Other G. AA H. BB I. CC J. DD
What causes the arcs and bubble shapes in the dust and gas distribution of the Orion Nebula?
A.) Previous generations of supernovae. B.) Photon pressure of newly formed stars. C.) Gravity waves from black holes. D.) Stellar wind from local stars. E.) Synchrotron radiation.
The celestial equator is always located ________.
A. running east to west, between the ecliptic and the North Celestial Pole B. running due east to due west, 90 degrees from the north Celestial Pole C. in the northern sky, at an altitude equal to your latitude D. running north to south, and directly overhead E. None of these choices is correct.