Modern telescopes are capable of seeing bright galaxies up to about
A) 1 million light-years away.
B) 10 million light-years away.
C) 1 billion light-years away.
D) 10 billion light-years away.
E) 1 trillion light-years away.
D
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Climate models which ignore human activity
A) completely fail to match real climate data B) match real climate data quite well C) match real climate data perfectly D) match real climate data, but only poorly
Consider the two situations shown in the figure below, in which there is no acceleration. In both cases the men pull with a force of magnitude F. How does the reading on the scale in part (i) of the figure relate to the reading on the scale in part (ii)?
Briefly explain why antimatter is so difficult to store after it is produced in laboratories.
What will be an ideal response?
Metabolism is a term that describes the
A) breaking down of complex organic molecules by bacteria B) rate at which molecules travel across cell membranes C) chemical processes that occur inside cells D) rate of cell division of bacteria