Molten rock material on Earth's surface is known as ______________
Fill in the blank(s) with correct word
lava
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Which statement about motion in the universe is not true?
A) The mysterious dark matter is the fastest-moving material in the universe. B) Some stars in the Milky Way Galaxy are moving toward us and others are moving away from us. C) Except for a few nearby galaxies, all other galaxies are moving away from us. D) Your speed of rotation around Earth's axis is faster if you live near the equator than if you live near the North Pole.
Compared to the interstellar medium, the gases in a planetary nebula will be richer in helium and carbon
Indicate whether the statement is true or false
Potential: As a proton moves in the direction the electric field lines
A. it is moving from low potential to high potential and gaining electric potential energy. B. it is moving from low potential to high potential and losing electric potential energy. C. it is moving from high potential to low potential and gaining electric potential energy. D. it is moving from high potential to low potential and losing electric potential energy. E. both its electric potential and electric potential energy remain constant.
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 20 km/s/Mly. How fast would a galaxy 1000 Mly distant be receding from us?
A) 20,000 km/s B) 20 Mly/s C) 0.20 times the speed of light D) 50 km/s E) 20 km/s