Evidence that tidal interactions and collisions of galaxies may make ordinary galaxies active is that
a. many active galaxies are distorted.
b. some active galaxies have companions.
c. many active galaxies are distorted and some active galaxies have companions.
d. active galaxies are neither distorted nor have companions.
c
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Star X has an apparent magnitude of 3, and star Y has an apparent magnitude of 8. What can we conclude?
A) Star X appears brighter in the night sky than star Y. B) Star Y appears brighter in the night sky than star X. C) Star X is farther away from us than star Y. D) Star Y is farther away from us than star X.
The gas pedal in a car is sometimes referred to as the " accelerator" which other controls on the vehicle can be used to produce acceleration?
A. the bakes B. Steering wheel C. gear Shift D. all the above
The Andromeda galaxy will eventually collide with the Milky Way
Indicate whether the statement is true or false
A radio wave signal, which transmits at a frequency of 5.64 MHz, has what wavelength? (c = 3.00 × 10^8 m/s)
a. 532 m b. 106 m c. 53.2 m d. 167 m e. 28.3 m