The most widely accepted and precise scientific estimate for the age of the universe is 13.8 billion years. This estimate is derived from detailed observations of the cosmic microwave background (CMB) radiation and the standard cosmological model (Lambda-CDM).
In 1 sextillion years (10²¹ years), the universe will be a vastly different, dark place: the era of star formation will have ended, all stars will have burned out into white dwarfs, neutron stars, or black holes, planets will be cold and lifeless, and even protons might begin to decay, leading towards the "Big Freeze" or heat death, with only black holes slowly evaporating via Hawking radiation over unimaginable timescales. All familiar structures, including galaxies, will have long dissolved as the universe expands, leaving behind a cold, dark, and nearly empty expanse.
According to their estimates the universe is 13.7 billion years old with an uncertainty of 200 million years. The WMAP value of Ho is 71 ± 4 km/s/Mpc which is in agreement with the HST key project. Astronomers determine properties of the universe by fitting the WMAP data with models.
In Big Bang cosmology, the Planck epoch or Planck era is the earliest stage of the Big Bang, before the time passed was equal to the Planck time, tP, or approximately 10−43 seconds.
About 95% of the universe is "invisible" because it's composed of dark matter (around 27%) and dark energy (around 68%), which don't emit, absorb, or reflect light, unlike the normal matter (stars, planets, us) that makes up the visible 5%. Dark matter's presence is inferred through its gravitational pull on visible galaxies, while dark energy is a mysterious force causing the universe's accelerated expansion.
Space, or outer space, is a vast, near-perfect vacuum largely devoid of matter. This vacuum contains very few particles compared with Earth's atmosphere. However, it's not entirely empty. Space is dotted with scattered matter called the interstellar medium, which includes hydrogen and helium atoms.
As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Despite its inclusion of the word "year", the term is not a unit of time.
Planck time is roughly 10 −43 seconds. However, to date, the smallest time interval that has been measured is 10 −21 seconds, a "zeptosecond." One Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to one Planck length.
The Universe expands very slowly, much slower than the speed of light. The expansion rate is 67 km/s per megaparsec. While 67km/s seems really fast, the megaparsec is a stupendously large unit (= 3.26M light years = 3 • 1019 km).
Based on known risks, the really cataclysmic ones, those that might exterminate us as a species, are fairly rare. Based on what we know today, it would be very unlikely that we wouldn't be around in the year 3000. There certainly would be bad times, but some of us would get through it.
Over the years, the Church of God has explained that God has a 7,000-year plan. While this is not specifically stated in Scripture, it is understood through history and scriptural analogy.
Hartle and Hawking claimed that if you wind the universe back to the beginning, time loses its distinct nature and effectively becomes space. With this no boundary hypothesis, the universe did not have an origin, not at least one we would ever really understand.
Finally, the planet will likely be absorbed by the Sun in about 7.5 billion years, after the star has entered the red giant phase and expanded beyond the planet's current orbit.
The Bible does not directly address the age of the Earth or the universe. The number of 6000 years came from Archbishop Ussher in the 17th century.
Humans Could Live For 1,000 Years by 2050—Ushering in the Dawn of 'Practical Immortality,' Futurists Say. Some experts warn that this radical change may remain out of reach for many, due to societal and economic challenges. Technology futurists foresee advances that will enable humans to live up to 1,000 years.
A plane travelling at 965 km/h (600 mp/h) would take 1 million years to travel one lightyear. A car with an average speed of 90 km/h (56 mph) would take 12 million years, and if you fancied a walk, at 5 km/h (3 mph) it would take you a whopping 216 million years to travel one lightyear, with no comfort breaks!
The Big Bang was the moment 13.8 billion years ago when the universe began as a tiny, dense, fireball that exploded. Most astronomers use the Big Bang theory to explain how the universe began. But what caused this explosion in the first place is still a mystery. So, what has happened since the Big Bang?
It is estimated that there are between 200 billion (2×1011) to 2 trillion galaxies in the observable universe.
The speed of light is said to be about 186,282 miles per second & 99.9999991% the speed of light (speeds reached on particle accelerator) is 186281.998323 miles per second.
The shortest duration ever measured is 247 zeptoseconds — the time it takes for a particle of light, or photon, to get from one side of a hydrogen molecule (illustrated) to another.
A jiffy is a real unit of time – 1/100th of a second to be precise. The earliest technical usage was in the late 19th century by Gilbert Newton Lewis. He proposed a unit of time called the “jiffy” which was equal to the time it takes light to travel one centimeter in a vacuum (approximately 33.3564 picoseconds).
Looking toward the sun we thus see a brilliant white light while looking away we would see only the darkness of empty space. Since there is virtually nothing in space to scatter or re-radiate the light to our eye, we see no part of the light and the sky appears to be black.
Yes, when you look at the Sun, you see it as it was about 8 minutes ago because light travels at a finite speed, taking roughly 8.3 minutes to cover the distance from the Sun to Earth, acting like a cosmic time machine, showing us the past of all celestial objects. This means if the Sun vanished, we wouldn't know for 8 minutes, and it also applies to everything else in space, with farther objects showing us even older history.
1 hour on Earth can equal 7 years in space (or vice versa) due to time dilation, a concept from Einstein's relativity where strong gravity or extreme speeds slow down time relative to an outside observer, famously depicted in the movie Interstellar on a planet near a black hole where an hour for the crew meant years passing on Earth. It's not about speed alone in orbit (ISS astronauts age slightly slower), but about proximity to immense mass, like a black hole, bending spacetime so drastically that time crawls for those nearby compared to time far away.