Final answer:
Our understanding of the composition of the universe has evolved over time. It now includes dark matter and dark energy, alongside ordinary matter. Dark matter and dark energy together comprise the majority of the universe's mass-energy.
Step-by-step explanation:
Our scientific understanding about the composition of the universe has evolved over time. Initially, scientists believed that the universe consisted of matter, known as ordinary matter, along with energy and radiation. However, further research and discoveries have led to the realization that the majority of the universe is made up of dark matter and dark energy, which cannot be directly observed. Dark matter is a type of matter that does not interact with light or other electromagnetic radiation, while dark energy is a hypothetical form of energy that is thought to be responsible for the accelerating expansion of the universe.
These developments have significantly changed our understanding of the universe's composition. While ordinary matter still plays a role, dark matter and dark energy have become key components. Currently, it is believed that ordinary matter contributes to only about 5% of the total mass-energy of the universe, while dark matter accounts for around 27% and dark energy makes up the remaining 68%. This shift in understanding has been possible due to advancements in observational astronomy, astrophysics, and cosmology over the years.
Learn more about evolution of scientific understanding about the composition of the universe