Red dwarf stars ____
a. never develop a hydrogen-fusion shell
b. create large amounts of carbon and oxygen
c. have much shorter lifetimes than Sun-like stars
d. never begin hydrogen fusion
e. become brown dwarfs after they exhaust their hydrogen core
a
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The most massive stars have masses somewhere around
A) 5 solar masses. B) 10 solar masses. C) 30 solar masses. D) 150 solar masses. E) 3000 solar masses.
What do we think condensed out of the solar nebula?
a. hydrogen and helium b. hydrogen compounds c. rocky material d. metals e. all except a
Which has the highest frequency?
A) red light. B) green light. C) blue light. D) all the same
From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm
What can we conclude? A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet.