1
time and change.
The ancients used thirteen towers to mark the month when the sun rises.
It takes 226 million years for the sun to orbit the Milky Way once.
The big bang of the universe more than 13 billion years ago.
In the microscopic realm, can time be reversed?
The flow of sea water and friction with the seabed cause the earth's rotation to slow down. Increment 70 microseconds per day.
Our day is now 15-16 minutes longer than it was in the age of dinosaurs.
The moon is moving away from Earth at a rate of 4 centimeters per year.
Three million years ago, there were no humans on Earth.
The distance we see is actually the past, and the farther away it is, the older it is.
Everything gets old.
The past is always more orderly than the present and the future.
When the star runs out of fuel, it becomes a low-brightness white dwarf, followed by a dimmer black dwarf. After a long decay, the universe is left with only light particles and black holes. Eventually the black hole will disappear, but the process is extremely long. The universe has reached the extreme point of decay, and it can no longer decay. There will no longer be a distinction between past, present, and future, and time will stop.
If all this can be reversed, if we can stop the universe from dying, there must be a part of the universe missing, and that is life.
Humanity is the momentary light in the long darkness of the universe.
2
Atoms and elements.
People who believe in Hinduism believe that there is no need to fear death. Death is like changing clothes and reincarnating.
In the age of dinosaurs, the Himalayas were still a vast ocean, and later it was the youngest mountain range.
Rock and life can be transformed into each other. Sedimentary rocks are formed by the deposition of dead bodies of living things.
Our body composition is the same as that of the stars.
By analyzing the spectra of stars, the content of various elements in stars can be calculated.
When two protons come together, one becomes a neutron. Multiple protons and neutrons are fused together to become another element through nuclear fusion.
It is difficult for two positively charged atoms to clump together, and once assembled, the energy of nuclear fusion is released. Nuclear equipment is needed on Earth, but happens on the sun from time to time, emitting light and heat.
Stars are just passers-by in space. Once hydrogen is burned out, stars will die.
The star first became a red dwarf, and the high temperature of 100 million degrees inside allowed further nuclear fusion of helium, giving birth to carbon and oxygen.
The carbon fuses further and becomes magnesium, sodium, neon, and aluminum. Eventually it becomes iron and then collapses due to gravity.
Gold mines are often either undiscovered or full of them.
Heavy metals above iron are only produced at the last moment of the demise of large stars, requiring a high temperature of 100 billion degrees and a supernova explosion.
Betelgeuse in the constellation Orion, 600 light-years away, may explode at any time with a supernova. At that time, the light will be like the second sun or full moon. At that time, there will be golden rain in the sky?
When large stars are destroyed, they are scattered into nebulae, and new stars and planets will appear in them.
The solar system was created in a nebula after a supernova explosion five billion years ago.
Every atom in our body originates from the depths of space.
Meteorites older than the earth have organic matter and amino acids found in them. The seeds of these life will also fall on other planets, indicating that other planets may also have life, as long as there are suitable conditions.
3
Gravity is the architect of everything in the universe.
Previous moons spin faster.
Earth's gravity causes tidal changes in the rocks on the moon's surface, which bulge, fall, and move, slowing the moon's rotation. The last thing we see on Earth is always the side of the moon.
The Andromeda constellation will approach, merge, collide, and merge with the Milky Way constellation, changing from a spiral galaxy to an elliptical galaxy, and the movement of stars into disorder.
The Milky Way is part of the Virgo cluster of galaxies.
Jupiter's gravity is twice that of Earth.
Eight times the gravity makes people starved of oxygen and unable to see color.
In 1054 there was a supernova explosion.
The supernova exploded, leaving behind the Crab Nebula, as well as neutron stars, or pulsars, whose gravitational pull was enormous.
Black holes are extreme forms of gravity. Some black holes originate from the demise of stars.
Black holes are extremely massive, but have very little space.
Black holes get bigger and bigger as they absorb matter. After the event boundary is exceeded, things can only be absorbed by the black hole and cannot escape.
After entering a black hole, space-time is distorted, and the laws of physics fail.
4
Light.
New stars are born in the Milky Way's Lagoon Nebula.
The essence of ocean waves is the transfer of energy.
A light-year is also a unit of time, and the farther we look, the more we can see into the past.
We see Saturn one hour ago and Neptune four hours ago.
The farthest constellation visible to the naked eye from Earth is Andromeda in the Milky Way.
2.5 million years ago, human beings were active on the African grasslands, and the starlight of Andromeda was just beginning to set off. The starlight of Andromeda we see now is from the constellation Andromeda when our ancestors were human.
The Hubble Space Telescope saw galaxies in the universe 13 billion years ago.
The farther away, the light is stretched and turns red. Galaxies in the depths of the universe are red, indicating that the universe is expanding, and it also indicates that the universe originated from a big bang and expanded from a small space.
The Big Bang created space-time.
The two ends of the universe are 93 billion light-years apart.
The longest wavelengths of light are radio waves.
The light at the beginning of creation is now the cosmic microwave background radiation, CMB, and it is everywhere.
After the Big Bang, the particle density was not uniform, resulting in various forms of celestial bodies. The first stars appeared 200 million years later.
Nine billion years after the Big Bang, the Orion arm gave birth to the sun.
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