How old is the universe? - NASA
2023年7月21日 · If the universe is "flat" and composed mostly of ordinary matter, then the age of the universe is 2/(3 H0). If the universe has a very low density of matter, then its extrapolated age is larger, 1/H0. If the theory of General Relativity is modified to include a cosmological constant, then the inferred age can be even larger.
How old is the universe? - New Scientist
Scientists’ best estimate is that the universe is about 13.8 billion years old. But, like so many of the largest-scale properties of the universe, we are not entirely sure about its age.
How Old is the Universe? | How They Know, Age & History - The …
2020年9月29日 · How do They Know the Universe is 13.8 Billion Years Old? They don’t, or at least, this is just a temporary number. Astronomers calculate the age of the Universe through different means. One of the most popular ways of calculating our Univers’s age is by finding the most ancient stars, or galaxies, maybe even planets.
How Big is the Universe? | Size, Why So Big, Infinite & Facts
2020年9月29日 · That’s how big our Universe is, and that’s not even the end of it. The 93 billion years is just the observable Universe, the Universe, which we can currently see. The whole Universe might very well be 250 times larger than the observable Universe, or at least 7 trillion light-years in diameter. Why is the Universe so Big?
The Universe | Facts, Information, History & Definition - The Nine …
2020年8月19日 · The age of the universe is predicted to be around 13.8 billion years old. Since the universe is expanding, it doesn’t have a center point. The universe is not only expanding, but it is also accelerating its expansion. Galaxies move away from each other but at the same time, space is also moving/expanding.
How Old is the Earth? | Age, Discovery, Life On Earth & Facts
2020年9月29日 · PSR B1620-26 b is estimated to be at around 12.7 billion years old, being only one billion years younger than the estimated age of the Universe (13.7 billion years). This planet orbits a white dwarf star and a neutron star. Compared to Earth, PSR B1620-26 …
Everything we know about the universe – and a few things we don't
2020年12月30日 · HOW OLD IS THE UNIVERSE? A CENTURY ago, if you asked a cosmologist the universe’s age, the answer may well have been “infinite”.It was a neat way to sidestep the question of how it formed ...
JWST has found the oldest galaxy we have ever seen in the universe
2022年7月20日 · Space JWST has found the oldest galaxy we have ever seen in the universe. Discoveries from the James Webb Space Telescope are pouring in, with an analysis of the latest data revealing a galaxy ...
StarChild: A Learning Center for Young Astronomers - NASA
2018年5月14日 · StarChild is a learning center for young astronomers ages 5-13 to learn about the solar system, the Milky Way galaxy, and the universe beyond. Use the links above to explore the site's topics. If you are looking for something a bit more advanced (ages 14+), then head on over to Imagine the Universe!
Redshift and Hubble's Law - NASA
The amount of departure, and the type, depends on the value of the total mass of the universe. In this way a plot of recession velocity (or redshift) vs. distance, which is a straight line at small distances, can tell us about the total amount of matter in the universe and may provide crucial information about the mysterious dark matter.
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