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

Question

Responses

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 ordinary matter has grown in scientists' estimates since the 1970s.
The percentage of ordinary matter has grown in scientists' estimates since the 1970s.

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 energy has shrunk in scientists' estimates since the 1980s.

Answer 1

The two correct answers regarding how scientific understanding of 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 energy has shrunk in scientists' estimates since the 1980s.

(Note: While 'the percentage of dark energy' has become a more recognized component of the universe composition, it is actually now thought to constitute around 68% of the universe, and it has generally not shrunk in estimates. The response "the percentage of dark matter has shrunk in scientists' estimates since the 1980s" is incorrect as dark matter is estimated to make up about 27% of the universe. Therefore, a more nuanced understanding of dark energy has grown while the percentages of dark matter and dark energy have been more steadily recognized as such. However, the majority view reflects that dark energy's percentage has not shrunk.)

Given the options you provided, the first is certainly a better choice. Please verify if both options are strictly correct based on the latest scientific consensus.