____________ galaxies contain a supermassive black hole at their centers while active nuclei are present in ____________of galaxies
a. Most; a few percent
b. Most; the majority
c. A small minority; a few percent
d. A small minority; the majority
a
Physics & Space Science
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An electron is an example of
A) a lepton. B) a meson. C) a baryon. D) a gauge boson. E) hadrons.
Physics & Space Science
The radiation era lasted for only the first few billion years of the Big Bang
Indicate whether the statement is true or false
Physics & Space Science
A star's ________ parallax is found by using the spectral lines to estimate the spectral class and luminosity of distant stars
Fill in the blank(s) with correct word
Physics & Space Science
When a gas changes phase to become a solid, energy is
A) absorbed. B) released. C) unchanged.
Physics & Space Science