Which is considered evidence for the Big Bang?

Which is considered evidence for the Big Bang?

• A. The presence of black holes in most galaxies
• B. Red shift
• C. The abundance of dark matter
• D. The shape of the Milky Way

Answer: (B)

Redshift provides evidence for the Big Bang because it shows the universe is expanding. When we look at light from distant galaxies, many of their spectral lines are shifted toward longer wavelengths—the red end. This shift is interpreted as galaxies moving away from us, and the farther away a galaxy is, the faster it appears to recede. This pattern, discovered as Hubble’s law, points to a cosmos that has been stretching over time, from a much denser, hotter origin—consistent with the Big Bang model. Other options don’t directly indicate the origin of the universe’s expansion: black holes in galaxies are fascinating and influence their environments, but they don’t reveal cosmic expansion. The abundance of dark matter tells us about mass content and gravitational effects, not the history of the universe’s expansion. The shape of the Milky Way is about our galaxy’s geometry, not evidence for how the universe began.

Redshift provides evidence for the Big Bang because it shows the universe is expanding. When we look at light from distant galaxies, many of their spectral lines are shifted toward longer wavelengths—the red end. This shift is interpreted as galaxies moving away from us, and the farther away a galaxy is, the faster it appears to recede. This pattern, discovered as Hubble’s law, points to a cosmos that has been stretching over time, from a much denser, hotter origin—consistent with the Big Bang model.

Other options don’t directly indicate the origin of the universe’s expansion: black holes in galaxies are fascinating and influence their environments, but they don’t reveal cosmic expansion. The abundance of dark matter tells us about mass content and gravitational effects, not the history of the universe’s expansion. The shape of the Milky Way is about our galaxy’s geometry, not evidence for how the universe began.