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 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 dark energy has shrunk in scientists' estimates since the 1980s.
The percentage of dark energy has shrunk in scientists' estimates since the 1980s.
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 unknown material has grown in scientists' estimates since the 1970s.
The correct answers are:
1. The percentage of ordinary matter has grown in scientists' estimates since the 1970s.
2. The percentage of unknown material has grown in scientists' estimates since the 1970s.
The correct answers are:
1. The percentage of ordinary matter has grown in scientists' estimates since the 1970s.
2. The percentage of dark energy has shrunk in scientists' estimates since the 1980s.
To understand how scientific understanding about the composition of the universe has changed over time, scientists use various methods and technologies to study the universe, such as telescopes, satellites, and particle accelerators. By observing and analyzing the data gathered from these sources, scientists have been able to refine their understanding of the composition of the universe.
In the 1970s, scientists had estimates that the majority of the universe was composed of dark matter and dark energy, which are forms of matter and energy that cannot be directly detected but have gravitational effects on visible matter. However, as research and observations progressed, the percentage of ordinary matter, or the matter that we can directly detect, has grown in scientists' estimates since the 1970s. This means that the understanding of the universe's composition has shifted the emphasis from dark matter and dark energy to ordinary matter, which includes galaxies, stars, planets, and other visible objects.
Additionally, scientists have also refined their estimates of dark energy since the 1980s. Dark energy is believed to be responsible for the observed accelerated expansion of the universe. As more data has been collected and analyzed, the percentage of dark energy in scientists' estimates has shrunk, indicating a better understanding of its role in the overall composition of the universe.
On the other hand, the percentage of unknown material, or material that scientists have yet to identify or understand, is not mentioned as growing in estimates since the 1970s. Therefore, the statement that the percentage of unknown material has grown in scientists' estimates since the 1970s is incorrect.