Multiple Choice
The universe contains about 10 times as many hydrogen atoms as helium atoms, but a helium atom has 4 times the mass of a hydrogen atom. What is the approximate ratio of the universe's hydrogen to helium by mass?
A) 2.5 to 1
B) 10 to 1
C) 4 to 1
D) 1 to 4
Correct Answer:
Verified
Correct Answer:
Verified
Q66: Which of these exoplanet characteristics is MOST
Q67: An asteroid belt has been discovered around
Q68: In searches for planets orbiting stars other
Q69: Observations of the exoplanet HD 209458 b
Q70: How have astronomers studied the atmospheres of
Q72: The birthplace of a star and planetary
Q73: Young stars are sometimes observed to have
Q74: In an exoplanet system in which a
Q75: The Kepler Space Telescope discovered thousands of
Q76: Which of these methods has provided strong