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:

Astronomers use cosmic microwave background radiation patterns. Dark energy affects the expansion rate but not directly for age - calculation. Earth rocks' age is much younger than the universe. Inner planets' motion is not used for universe - age determination. Cosmic microwave background radiation is a remnant of the early universe and its patterns help in age - related calculations.

Answer:

D. patterns of background radiation