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

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

1 answer

The correct changes in scientific understanding about the composition of the universe 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: While the percentage of dark energy has become a significant part of the universe's composition estimate, it has not shrunk; rather, scientists came to understand its large role in the universe. The percentage of ordinary matter has also not grown significantly in estimates over time.)