When we glimpse the chromosphere at the start and end of totality, its color is
A) green (the famous flash).
B) yellow, like the photosphere below it.
C) red, due to ionized hydrogen at lower pressure.
D) blue, due to the ionization of nitrogen by the magnetic fields.
E) white from the moonlight.
C
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Which of the following stars is hottest?
A. G B. F C. M D. O E. B
What is the most abundant molecule in interstellar clouds besides molecular hydrogen?
A) ammonia B) water C) methane D) molecular helium E) carbon monoxide
A shock wave is produced when the speed of an object
A) matches the speed of sound in air. B) exceeds the speed of sound in air. C) greatly increases in amplitude. D) none of the above
Kepler's first law states that Earth's orbit around the Sun takes the shape of a(n) ______________
Fill in the blank(s) with correct word