How is dust usually observed around young protostars in stages 4-6?
What will be an ideal response?
As the nebula contracts, it forms a dusty disk around the protostar's equator; often these are seen in profile with HST images around the protostars.
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If two stars have a magnitude difference of 5, what is their flux ratio?
a. 10.0 b. 12.6 c. 100.0 d. 250.0 e. 625.3
The technique of connecting multiple telescopes together to combine the images from each telescope is known as
a. aberration. b. resolving power. c. active optics. d. adaptive optics. e. interferometry.
Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both objects continue to fall, their separation
A) increases. B) decreases. C) stays constant. D) increases at first, but then stays constant. E) decreases at first, but then stays constant.
________ is the largest of the Galilean moons.
A. Io B. Europa C. Ganymede D. Callisto