This photograph shows what appears to be four identical quasars arranged as a cross. What are we really seeing?
A) four images of a single quasar, with the images formed by gravitational lensing because a large galaxy lies between us and the quasar
B) four quasars that are nearly identical because they were born at about the same time
C) a picture taken with a poorly made telescope so that a single large object appeared as four fuzzy dots
D) a large galaxy with four central masses that each glow brightly
A) four images of a single quasar, with the images formed by gravitational lensing because a large galaxy lies between us and the quasar
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Observations of young stars suggest that when the Sun was young, the solar wind
A) was weaker than it is today. B) was stronger than it is today. C) was about the same strength as it is today. D) was nonexistent. E) blew outward only along the Sun's poles.
Your weight as measured on your bathroom scale is
A) equal to your mass. B) the force due to gravity on you. C) a property of mechanical equilibrium. D) all of the above
What common gas assumes an uncommon state in the mantles of Jupiter and Saturn? Why?
What will be an ideal response?
In an energy level transition from the n = 2 state to the n =1 state for a hydrogen atom a photon will be ___________
Fill in the blank(s) with correct word