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Cosmic expansion quick check

A quick check of 3 questions. After you submit, each question shows the right answer and why.

3 of 11 questions, Advanced level. Aimed at the Advanced level, your current depth. Questions you have not answered yet come first.

Show all 11 questions

ScientistQuestion 1 of 3

What is the cosmic microwave background?

AdvancedQuestion 2 of 3

The age of the universe is close to the 'Hubble time' 1/H₀. Taking H₀ = 70 km/s/Mpc, 1 Mpc = 3.09 × 10¹⁹ km and 1 year = 3.16 × 10⁷ s, calculate 1/H₀ in billions of years (one decimal place).

AdvancedQuestion 3 of 3

Planck (with the standard ΛCDM model) gives H₀ = 67.4 km/s/Mpc and SH0ES gives 73.04 km/s/Mpc. What is the difference between them, in km/s/Mpc, to one decimal place?