Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms are ionized
Indicate whether the statement is true or false
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It is expected that planets around high-mass main-sequence stars would be good places to search for extraterrestrial life
a. True b. False Indicate whether the statement is true or false
In the context of understanding stellar lives, "high-mass" stars have masses
A) more than about 8 times the mass of our Sun. B) more than about 3 times the mass of our Sun. C) more than twice the mass of our Sun. D) more than 20 times the mass of our Sun.
The Big Bang predicts that one in four atoms in the universe is helium
Indicate whether the statement is true or false
What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
A) the strong force and the weak force B) gravitational force and outward pressure C) gravitational force and surface tension D) the strong force and the electromagnetic force