Which theory explains that the universe began from a single, extremely dense point and expanded?

• A. Steady State Theory
• B. Heliocentric Theory
• C. Big Bang Theory
• D. Geocentric Theory

Answer: (C)

The idea being tested is how scientists describe the origin and expansion of the universe. The Big Bang theory explains that the universe began from an extremely dense, hot point and has been expanding over time. This view fits a wide range of observations: distant galaxies are redshifted, showing they are moving away; the cosmic microwave background provides a relic signal from a hot early universe; and the observed abundances of light elements match predictions from early-ununiverse nucleosynthesis. Taken together, these clues point to a single, dense beginning followed by continuous expansion.

In contrast, the Steady State Theory proposes that new matter continually forms as the universe expands to keep its density constant, which doesn’t align with the detailed evidence we observe about the early universe. The heliocentric and geocentric theories describe the arrangement of bodies within our solar system rather than the origin or large-scale evolution of the universe, so they don’t address how the universe began or expanded. Far and away, the Big Bang theory best explains the observed expansion from a single dense point.