An exoergic reaction
a. absorbs energy.
b. requires a high temperature.
c. releases energy.
d. occurs only in stars.
c
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The _______________ is a high temperature, low density region in the interstellar medium around the Sun
Fill in the blank(s) with correct word
Approximately how long does it take stars in our region of the Milky Way to complete an orbit around the center of the Milky Way Galaxy?
A) 20,000 years B) 200,000 years C) 2 million years D) 200 million years E) 2 billion years
The typical size of the interstellar dust particles is ________ and they consist of ________.
A. about a micrometer or less; silicates and carbon compounds B. 1 cm; silicates and carbon compounds C. about a micrometer or less; hydrogen and helium D. 1 mm; hydrogen and helium
What is so unusual about Pluto's orbit?
A) Its orbital period is exactly twice that of Neptune's. B) It lies exactly on the ecliptic. C) It has an unexpectedly short orbital period. D) It is more inclined to the ecliptic than any of the eight planets. E) It has the lowest eccentricity of any planet's orbit.