Concerning dark energy, we do know:
A) that it is created when matter annihilates anti-matter.
B) its density remains constant over time, so it is not important in the early Universe.
C) combined with dark matter, it will ultimately produce a closed universe.
D) that it was revealed with Type II supernovae distances in the late 1990s.
E) that it makes up 90 of all the matter and energy in the whole universe.
Question 2
The atmosphere of Venus is about 95 ________.
Fill in the blank(s) with correct word
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