How did scientists determine the Big Bang occurred 13.7 billion years ago?

Answer 1

Hubble constant #H_0# is estimated as 71 km/s/megaparsec ( #[H_0]=T^(-1)# ). The reciprocal 1/71, expressed in billion years, is 13.77 that is an estimate of life of our universe, since Big Bang.

Estimates of the speed at which a galaxy recedes from another

Doppler Effect: A source's light is wave-shifted when it leaves the source

duration by the light source's motion). Edward Powell Hubble (

1889–1953) had found a linear relationship between the

both the distance and the speed.

Hubble constant #H_0# is estimated as 71 km/s/megaparsec (

#[H_0]=T^(-1)#= 1/Time ). The reciprocal 1/71 expressed in billion

years is 13.77. This is just a conversion issue with units.

This could be a lower bound for the amount of time that had

Since the Big Bang, more research advancements have occurred.

that raise the upper bound on this considerably.

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Answer 2

Hailey Alvarez

The current estimate of the universe's age, 13.7 billion years, is supported by a variety of methods used by scientists to determine the age of the Big Bang. These methods include measurements of the universe's expansion rate, observations of the cosmic microwave background radiation, and analyses of the oldest objects in the universe, such as globular clusters and specific types of stars.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.