Mercury, Venus, and Earth have similar densities
Indicate whether the statement is true or false
TRUE
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In the context of life in the universe, which of the following discoveries of astronomy suggests that there has been plenty of time for life to have appeared and evolved elsewhere?
A) the universe is very large B) the universe is very old C) the laws of physics are the same everywhere D) the building blocks of life are common
A change in the direction of a wave as a result of its encountering a sharp edge or a slit is called ______________
Fill in the blank(s) with correct word
Which of the following best explains why Jupiter’s density is higher than Saturn's?
a. Jupiter is more massive than Saturn. b. Jupiter has a higher proportion of hydrogen compounds and rock than Saturn. c. Jupiter is closer to the Sun than Saturn. d. Jupiter has a stronger magnetic field than Saturn.
Which of the following are candidates for galactic dark matter?
A) faint red stars B) brown dwarfs C) Jupiter-size objects D) WIMPs E) all of the above