What do astronomers use to calculate the age of the universe? check all that apply. dark energy the age of rocks on earth the age of the oldest stars patterns of background radiation how fast distant galaxies are moving away from us

The answers are:

The age of the oldest stars

How fast distant galaxies are moving away from us

Patterns of background radiation

Using these techniques, and using the Big Bang as reference point, astronomers estimate that the universe may be approximately 12 billion years old.

the age of the oldest stars

patterns of background radiation

how fast distant galaxies are moving away from us

the answer is false because not all countries have geysers under their crust. for example, iceland uses geothermal energy because it is available every in their country.  

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: