Based on the observed red shifts in the spectral lines of distant galaxies,astronomers conclude that ________.
A)Earth is in the center of the universe
B)the universe is contracting
C)the universe is expanding
D)the universe is in a steady state

Question

Quizplus · Accepted Answer

The observed red shifts in the spectral lines of distant galaxies indicate that they are moving away from us, which suggests that the universe is expanding. This is known as Hubble's Law, named after Edwin Hubble who first discovered this phenomenon in 1929. This evidence contradicts the idea that Earth is in the center of the universe, which was a common belief before Hubble's discovery. Additionally, it does not support the idea that the universe is contracting, as the red shifts suggest that galaxies are moving away from each other rather than towards a central point. The concept of a steady-state universe is also inconsistent with this evidence, as it assumes that the universe does not change over time.

Based on the Observed Red Shifts in the Spectral Lines