The moons of Mars are believed to be
a. composed primarily of iron and nickel.
b. composed primarily of frozen gases of water and carbon dioxide.
c. orbiting Mars in a direction opposite to the direction that Mars rotates.
d. formed from material ejected from Olympus Mons and other large volcanoes on Mars.
e. captured asteroids.
e
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Type II supernovae are believed to occur when the cores of massive stars collapse
a. True b. False Indicate whether the statement is true or false
What is the significance of this image?
A) It shows an actual disk of material orbiting another star, providing strong evidence the planets really do form in such disks. B) It shows an artist's conception of what our solar system might have looked like when the planets were first forming. C) It proves that jovian planets form farther from their stars than terrestrial planets. D) The large gap visible in the image represents the frost line of a young planetary system, demonstrating that such a line really exists.
Ground telescopes view the light coming from celestial objects through the turbulent atmosphere of the Earth. The distortion effect this turbulence causes to the light passing through it is called:
a. dispersion b. seeing c. blending d. refraction
Given the equation 
, which answer provides the best description of a possible physical situation?
A. A 3.00-kg mass is suspended from the ceiling. B. A 2.00-kg mass hanging over a pulley drags a 3.00-kg mass along a frictionless horizontal surface. C. A 3.00-kg mass hanging over a pulley drags a 2.00-kg mass along a frictionless horizontal surface. D. A 3.00-kg mass hanging over a pulley drags a 5.00-kg mass along a frictionless horizontal surface. E. A 5.00-kg mass hanging over a pulley drags a 3.00-kg mass along a frictionless horizontal surface.