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Stars, Galaxies, and the Universe
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ACT Prep
AS.131 Stars, Galaxies, and the Universe
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A redshift-distance plot includes error bars for measured galaxy distances. Although individual points scatter, the best-fit line rises steadily. Which conclusion is justified?
A
The error bars mean no conclusion can ever be drawn.
B
The data prove every galaxy has exactly the same redshift.
C
The data support a positive relationship between distance and redshift despite measurement uncertainty.
D
The best-fit line should be ignored because one point is above it.
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