The Crab Nebula is a bright, long lasting supernova remnant that was made by a ________ supernova
Fill in the blank(s) with correct word
type II
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Tungsten is a BCC metal with a lattice parameter of 0.3165 nm. What is the direction and magnitude of the Burger’s vector in tungsten, corresponding to the plane and direction of maximum packing density?
What will be an ideal response?
The radioactive ages of the moon rocks show that the Moon's surface solidified about _____
A) 2.5 billion years ago B) 3.4 billion years ago C) 4.4 billion years ago D) 5.5 billion years ago
According to general relativity, why does the Earth orbit the Sun?
A) The Sun causes spacetime to curve, and Earth follows the straightest path through that curved spacetime. B) The Earth feels a force directed toward the Sun that pulls it inward. C) The universe has a spherical geometry, causing all objects within it to take closed orbits. D) The Earth only appears to be moving in an orbit because of length contraction and time dilation.
About how deep is the photosphere?
A) 300 meters B) 500 meters C) 300 km D) 500 km