Question

which is one piece of information that astronomers use to calculate the age of the universe? dark energy the age of rocks on earth the current motion of inner planets patterns of background radiation

Explanation:

• Dark energy is a concept related to the expansion of the universe but not directly used to calculate its age.
• The age of rocks on Earth is much less than the age of the universe (Earth is a relatively young part of the universe).
• The current motion of inner planets is related to gravitational interactions and orbital mechanics, not the age of the universe.
• Patterns of background radiation (cosmic microwave background radiation) are crucial. The cosmic microwave background (CMB) is radiation left over from an early stage in the development of the universe. By studying its properties (such as temperature fluctuations and its spectrum), along with other cosmological parameters (like the Hubble constant), astronomers can calculate the age of the universe.

Answer:

patterns of background radiation