A blue photon
A) has a smaller wavelength than a red photon and travels with the same speed.
B) has a smaller wavelength than a red photon and travels with a greater speed.
C) has a longer wavelength than a red photon and travels with the same speed.
D) has a longer wavelength than a red photon and travels with a greater speed.
A
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We can study how galaxies evolve because
A) we can watch as they interact in real time. B) the farther away we look, the further back in time we see. C) galaxies are transparent to visible light. D) we are really smart astronomers.
What is the least common class of star in our galaxy?
A) A-type B) M-type C) O-type D) G-type
The star Alpha Centauri A is the same type of star as the Sun, but its luminosity is about 1.6 times that of the Sun. What can we conclude?
A) Alpha Centauri A must have a vastly different interior structure than the Sun. B) Alpha Centauri A fuses hydrogen into helium in its core at a higher rate than our Sun. C) Alpha Centauri A has a much higher surface temperature than the Sun. D) Alpha Centauri A is much farther from Earth than the Sun.
If the Galactic Year is defined as the orbital period of the solar system, how long does it take us to circle the center? How do we know?
What will be an ideal response?