The density parameter Ω₀ measures the total mass-energy density in the universe from all sources as a function of the critical density. How much of this is from ordinary atomic matter and how much from dark matter? A)About 5% is from ordinary matter and another 26% from dark matter. B)About 24% is from ordinary matter and the remaining 96% is from dark matter. C)About 50% is contributed by each of these sources. D)About 96% is from atomic matter and the remaining 4% is from dark matter.

Question

Quizplus · Accepted Answer

According to current measurements and observations, about 5% of the total mass-energy density in the universe comes from atomic matter, while another 26% comes from dark matter. Therefore, the total contribution from these two sources is about 31%. The remaining 69% is thought to be from dark energy. Option A accurately reflects this current understanding of the composition of the universe.

The Density Parameter Ω0 Measures the Total Mass-Energy Density in the Universe

The Density Parameter Ω₀ Measures the Total Mass-Energy Density in the Universe