Contrast the composition of asteroids with that of comets
What will be an ideal response?
Asteroids are rocky and/or metallic while comets are made of ice, with some dust or dirt (commonly described as "dirty snowballs").
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One phenomenon that the geocentric models struggled to explain was ________.
A. retrograde motion B. sunspots C. the rotation of Earth D. parallax E. epicycles
Briefly describe the Orion Nebula
What will be an ideal response?
An aluminum wire and a steel wire, each of length 2.0 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 2.2 mm
What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? Young's modulus for aluminum is 0.70 × 1011 Pa and for steel it is 2.0 × 1011 Pa.
A neutron star is
A) the remains of a star that died in a massive star supernova (if no black hole was created). B) the remains of a star that died by expelling its outer layers in a planetary nebula. C) a star made mostly of elements with high atomic mass numbers, so that they have lots of neutrons. D) an object that will ultimately become a black hole.