Only ________ stars have rotation periods of less than a second
Fill in the blank(s) with correct word
neutron
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The primary way that we observe the atomic hydrogen that makes up most of the interstellar gas in the Milky Way is with
A) radio telescopes observing at a wavelength of 21 centimeters. B) ground-based visible-light telescopes. C) space-based ultraviolet telescopes. D) x-ray telescopes.
How do we know what goes on under the surface of the Sun?
A) We have X-ray images from satellites of the interior of the Sun. B) Astronomers create mathematical models that use the laws of physics, the Sun's observed composition and mass, and computers to predict internal conditions. C) We have sent probes below the surface of the Sun. D) By measuring Doppler shifts, we observe vibrations of the Sun's surface that are created deep within the Sun. E) both B and D
Heat is thermal energy that flows due to
A) molecular speed. B) calorie imbalance. C) temperature differences.
The Milky Way is
A) a spiral galaxy. B) an elliptical galaxy. C) an irregular galaxy. D) a galaxy in the making. E) the remains of a galaxy that has run its life course.