Compared to our Sun, a typical white dwarf has:
A) about the same mass and density.
B) about the same mass and a million times higher density.
C) a larger mass and a 100 times lower density.
D) a smaller mass and half the density.
E) a smaller mass and twice the density.
B
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Pressure (P) waves move as displacements of particles perpendicular to the waves' direction of travel
a. True b. False Indicate whether the statement is true or false
Two stars are both spectral type K2V; if the closer is magnitude +3.7, and the fainter is magnitude +8.7, then the brighter star is about ________ times closer
Fill in the blank(s) with correct word
The force required to maintain an object at a constant velocity in free space is equal to
A) zero. B) the mass of the object. C) the weight of the object. D) the force required to stop it.
Which exoplanet detection method requires us to be in the same plane as the exoplanetary system?
A. Direct imaging B. Transit method C. Radial-velocity method D. Gravitational lensing E. None of these choices are correct.