How do physicists know how old the universe is? They say it is about 13 billion years old, but how are they able to know this when they were not there when the universe was created?
According to research. Astromers can determine the age of the universe by studying the oldest object within the universe and measuring how fast it is expanding.
Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.
Fayo Ola asked 4 years ago
That is a good question 🤔.
According to research. Astromers can determine the age of the universe by studying the oldest object within the universe and measuring how fast it is expanding.
But they don’t actually know the age universe is .
how do they know the age of the oldest object
Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.
how sure are they