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# Long description

The figure consists of two parts labelled (a) and (b) that illustrate the matter and energy content of the present-day Universe, and the early Universe soon after the big bang, as two pie charts. Part (a) is labelled ‘today’. The pie chart is segmented as follows: dark energy 70 percent, dark matter 25 percent, and baryonic matter 5 percent. Part (b) is labelled ‘13.7 billion years ago (Universe 380,000 years old)’. The pie chart is segmented as follows: dark energy 63 percent, photons 15 percent, baryonic matter 12 percent, and neutrinos 10 percent.