Two uses of ultrasound are navigation by bats and controlling insects
Indicate whether the statement is true or false
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By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding.
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies were born at the same time, and all will die at the same time. C) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. D) All galaxies outside the Local Group are orbiting the Local Group. E) Galaxies are in motion throughout the universe, with about equal numbers moving toward us and away from us.
The Moon and the Sun are approximately the same angular size
Indicate whether the statement is true or false
You would expect millisecond pulsars to be:
A) part of a binary system. B) isolated in space. C) rotating slowly. D) most common in open clusters. E) collapsing rapidly.
Triton's source of internal heat is mostly associated with
A) tidal heat associated with its elliptical orbit around Neptune B) tidal heat left over from it being captured into orbit around Neptune C) radioactive decay D) heat left over from its formation