The observable universe is currently 1.38×10 10 (13.8 billion) years old. This time is in the Stelliferous Era . About 155 million years after the Big Bang, the first star formed. Since then, stars have formed by the collapse of small, dense core regions in large, cold molecular clouds of hydrogen gas.
What universe era do we live in?
We live in the most recent period, the Quaternary, which is then broken down into two epochs: the current Holocene , and the previous Pleistocene, which ended 11,700 years ago. The Holocene began at the end of the last ice age, when glaciers started retreating.
What are the eras of the universe?
The book divides the timeline of the universe into five eras: the primordial Era, the Stelliferous Era, the Degenerate Era, the Black Hole Era and the Dark Era .
How long will the degenerate era last?
Degenerate Era: 10 14 years -> 10 45 years
After t=10 15 years: Gravitational encounters between stars are rare, but disrupt orbiting systems: –Planetary systems get disrupted by stellar encounters and their planets scattered.
What was the first thing in the universe?
The Big Bang is thought to have kick-started the universe about 13.7 billion years ago. At first, the universe was too hot and dense for particles to be stable, but then the first quarks formed, which then grouped together to make protons and neutrons, and eventually the first atoms were created.
Will the universe end?
Astronomers once thought the universe could collapse in a Big Crunch. Now most agree it will end with a Big Freeze . ... Trillions of years in the future, long after Earth is destroyed, the universe will drift apart until galaxy and star formation ceases. Slowly, stars will fizzle out, turning night skies black.
What era do we live in 2020?
According to the International Union of Geological Sciences (IUGS), the professional organization in charge of defining Earth’s time scale, we are officially in the Holocene (“entirely recent”) epoch, which began 11,700 years ago after the last major ice age.
How many universes are there?
There are still some scientists who would say, hogwash. The only meaningful answer to the question of how many universes there are is one, only one universe .
How long was the Black Hole Era?
The period following the demise of black holes is known as the Dark Era, which is expected to begin sometime around 10101 years after the Big Bang , though its start depends on how long black holes last. So when — and if — this era ends is anybody’s guess. Our understanding of the cosmos is far from complete.
What will happen in 100 trillion years?
And so, in about 100 trillion years from now, every star in the Universe, large and small, will be a black dwarf . An inert chunk of matter with the mass of a star, but at the background temperature of the Universe. So now we have a Universe with no stars, only cold black dwarfs. ... The Universe will be completely dark.
Will a black hole come to earth?
Absolutely not . While a black hole does have an immense gravitational field, they are only “dangerous” if you get very close to them. ... It would get very dark of course and very cold, but the black hole’s gravity at our distance from it would not be a concern. Is there life on other planets?
Where do things go in a black hole?
It is thought that the matter that goes into a black hole gets crushed into a tiny point at the center called a “singularity” . That’s the only place that matter is, so if you were to fall into a black hole you wouldn’t hit a surface as you would with a normal star. Once it’s there, it’s there.
What is the fastest thing in the universe?
Laser beams travel at the speed of light , more than 670 million miles per hour, making them the fastest thing in the universe.
What happens when you reach the end of space?
It will expand forever; the galaxies within groups and clusters will merge together to form a giant super-galaxy ; the individual super-galaxies will accelerate away from one another; the stars will all die or get sucked into supermassive black holes; and then the stellar corpses will get ejected while the black holes ...
Does space ever end?
Many think it’s likely you would just keep passing galaxies in every direction, forever. In that case, the universe would be infinite, with no end . ... Scientists now consider it unlikely the universe has an end – a region where the galaxies stop or where there would be a barrier of some kind marking the end of space.
Is time Travelling possible?
Time travel to the past is theoretically possible in certain general relativity spacetime geometries that permit traveling faster than the speed of light, such as cosmic strings, traversable wormholes, and Alcubierre drives.
