Which of the following statements is thought to be true of the jovian planets?
A) All have cores of about the same mass, but differ in the amount of surrounding hydrogen and helium.
B) The major differences between the planets can be explained by the different masses of their cores.
C) Jupiter and Saturn are made mostly of ammonia while Uranus and Neptune are mostly methane.
D) Jupiter and Saturn are made mostly of hydrogen while Uranus and Neptune are mostly helium.
A) All have cores of about the same mass, but differ in the amount of surrounding hydrogen and helium.
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Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
and 
, what is the direction of the vector 
?
A. ?49°
B. ?41°
C. ?90°
D. +49°
E. +21°
Cepheid variables are useful in measuring the distance to ____
a. globular clusters and dwarf galaxies around the Milky way, but nothing farther b. globular clusters and the Andromeda Galaxy, but not more distant objects c. galaxies that are within 30 megaparsecs, a relatively short distance d. galaxies that are moderately far away, up to about 500 megaparsecs e. galaxies and galactic clusters within a gigaparsec of the Milky Way
As a projectile moves in its parabolic path, the velocity and acceleration vectors are perpendicular to each other
1.everywhere along the projectile’s path. 2.at the peak of its path. 3.nowhere along its path. 4.not enough information is given.
Which distance measurement technique is best suited to measuring objects at a distance of 10 million light-years?
What will be an ideal response?