Answers25-26 Dally -- Earth and Space Science 4th 9 Weeks BLDGUnit Test — Unit testQuestion 25
25
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Unit Test — Unit test

Question 25 • (25-26) Dally -- Earth and Space Science 4th 9 Weeks BLDG

What can be observed only by observing its effects on gravity?

Answer
A
dark matter
B
a solar nebula
C
gas and dust
D
a planetesimal
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