After an initial accelerated expansion called the inflationary epoch at around 10 −32 seconds, and the separation of the four known fundamental forces, the universe gradually cooled and continued to expand, allowing the first subatomic particles and simple atoms to form.

In physical cosmology, the age of the universe is the time elapsed since the Big Bang: 13.8 billion years. [1] Astronomers have two different approaches to determine the age of the universe.

The chronology of the universe describes the history and future of the universe according to Big Bang cosmology. Research published in 2015 estimates the earliest stages of the universe's existence as taking place 13.8 billion years ago, with an uncertainty of around 21 million years at the 68% confidence level. [1]

2020年9月29日 · One astronomical unit is 149,598,000 km / 92,955,887 miles, and in our top shape, we could reach it in 25 days. Now, the Universe is 93 billion light-years across, and one, just one light-year, is equivalent to 63,000 astronomical units.

2024年6月12日 · Astronomers widely accept that the universe formed in the Big Bang approximately 13.8 billion years ago. It has been expanding ever since. This expansion explains how a...

2024年4月8日 · The Universe we observe is 13.8 billion years old, but what came before it (and for how long) is still firmly in the realm of speculation. Ethan is on medical leave until May 6th.

2024年12月22日 · Just how long has the universe been around? Scientists estimate the universe is 13.8 billion years old, with an uncertainty of plus or minus just two percent. But how do we know?

2021年3月29日 · When we look in any direction, the furthest visible regions of the Universe are estimated to be around 46 billion light years away. That's a diameter of 540 sextillion (or 54 followed...

2023年7月21日 · How old is the universe? Answer: UPDATE (July 21, 2023)! Measurements made by NASA's WMAP spacecraft have shown that the universe is 13.77 billion years plus or minus 0.059. The age was further refined by ESA's Planck spacecraft to be 13.8 billion years old.

2022年3月15日 · When the universe was just 10 -34 of a second or so old — that is, a hundredth of a billionth of a trillionth of a trillionth of a second in age — it experienced an incredible burst of...