Fill in the blank in the following chemical reaction thatoccurs in the Sun:Deuterium+proton=??+ energy:
a) deuterium-2
b) hydrogen-1
c) helium-3
d) carbon-12
e) helium-4
Ans: c) helium-3
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What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun? Pick the best answer
a. 1.8 × 10^11 years b. 1.8 × 10^10 years c. 1.8 × 10^8 years d. 1.8 × 10^6 years e. 1.8 × 10^3 years
Why are stars no longer forming in the galactic halo?
A) Frequent supernovae blew all the halo gas out into intergalactic space. B) There was never star formation in the halo; its stars were ejected from the disk. C) Only low-mass stars formed in the halo, so there were no stellar winds or supernovae to recycle gas. D) The cold molecular gas required for star formation is in the galactic disk.
Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. With no air resistance, the projectile to hit the ground first will be the one fired at
A) 30°. B) 60°. C) both hit at the same time
Which of the following represents the shortest distance?
a. One parsec b. One astronomical unit c. One light-year d. One right ascension