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How has scientific understanding about the composition of the universe changed over time? Select the two correct answers.(1 point)

Responses

The percentage of ordinary matter has grown in scientists' estimates.
The percentage of ordinary matter has grown in scientists' estimates.

The percentage of unknown material has grown in scientists' estimates since the 1970s.
The percentage of unknown material has grown in scientists' estimates since the 1970s.

The percentage of dark matter has shrunk in scientists' estimates since the 1980s.
The percentage of dark matter has shrunk in scientists' estimates since the 1980s.

The percentage of dark energy has shrunk in scientists' estimates.

1 answer

The two correct answers regarding how scientific understanding about the composition of the universe has changed over time are:

  1. The percentage of unknown material has grown in scientists' estimates since the 1970s.
  2. The percentage of dark matter has shrunk in scientists' estimates since the 1980s.

(Note: For the context of current scientific understanding, dark matter has actually been assessed as making up about 27% of the universe, while dark energy constitutes about 68%. The percentages for dark energy and dark matter have been relatively stable, and the increase in estimates of unknown material reflects the ongoing exploration of the universe.)