How old is everyone in the universe?
Those values have all converged on the same expansion rate: 68 km/s/Mpc, with an uncertainty of just 1-2\%. When you calculate what that means for the age of the Universe, you get a very robust 13.8 billion years, completely consistent with everything we know about stars.
Do we know the exact age of the universe?
We do not know the exact age of the universe, but we believe that it is around 13 billion years – give or take a few billion. Astronomers estimate the age of the universe in two ways: (a) by looking for the oldest stars; and (b) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang.
How old are the stars?
Most stars are between 1 billion and 10 billion years old. Some stars may even be close to 13.8 billion years old—the observed age of the universe. The oldest star yet discovered, HD 140283, nicknamed Methuselah star, is an estimated 14.46 ±
How old is the universe?
To any of these observers, whether on another star, in another galaxy or all the way across the Universe, they would see a very similar Universe to us: A Universe that’s 13.8 billion years old today. A Universe where, in every direction that they look, they appear to be seeing farther back into the past.
When will the universe’s age crisis end?
Most astronomers believe that this crisis will pass as soon as our measurements improve. Although the numbers are still very uncertain, the different data sets are starting to converge at an age for the universe of about 12 to 13 billion years.
How far back in time has the universe gone?
In fact, as we look farther and farther away, we’ve found galaxies that go as far back as when the Universe was less than one billion years old, and was just a few percent of its current age. Looking back a variety of distances corresponds to a variety of times since the Big Bang.
Why is the age of the universe so difficult to estimate?
The uncertainty in this estimate is due to the difficulty in determining the exact distance to a globular cluster and in our ignorance of some of the details of how stars evolve. An alternative approach to estimate is the age of the universe is to measure the “Hubble constant”.