Why does the earth spin?

Why does the earth spin? Feel this topic is very general, it is a little difficult to answer.
, according to the unreliable legend, the great physicist Newton, is "why the earth spin" to drive mad.
in fact, about why the earth is self-orbiting, probably because everything in the universe is self-rotation, for example, the sun also spins, the moon, the Milky Way, the eight planets, etc. also have rotation, and some people speculate that the universe is also self-rotation, and these are related to the formation of celestial bodies.
so, since all the celestial bodies in the universe have rotations, it would be very strange if the earth had not turned.
scientists speculated that the "solar system" before it took shape, like a spinning dust "big cake", in this big cake, the planets self-formed, then, the rotation of the major planets in the same direction, is the same.
study found that the Earth is made of heavy-element dust and clumps emitted by various hydrogen, helium, and supernova eruptions.
and it formed as part of the solar system, in the process of self-condensation formation, as long as there is a small "intersection allotment imbalance", it will produce "rotation."
, the Earth's rotation speed and angle, are often affected by the universe's larger environment, such as the formation of the moon's "Yuya collision", as well as the moon's "gravitational perturbation", etc., may cause the Earth to rotate.
, the basic process of celestial formation is its own "shrinkage" under the influence of "gravity".
and, because the material before contraction, it is impossible to have absolutely no motion, and these movements are relative to the center of the contraction, so every celestial body in the universe will move.
it can be seen that the cause of the Earth's rotation is the same as its rotation - the imbalance of the angular momentum when "gravity attracts".
study found that the earth's rotation axis is from west to east.
if you look above the North Pole, you'll see the Earth's "clockwise rotation" dynamic, but if you look above the South Pole, you'll see a "clockwise rotation" of the Earth.
, the scientists also observed that the Earth's "axis of rotation" is at an angle of 66.34 degrees to the ecliptal plane, but perpendicular to the equatorial surface.
in fact, the earth does not turn for no reason because it has no power inside.
so, "the earth in rotation" does not mean "the earth itself", the last century of the French physicist Condraplas proposed that the Earth's rotation power from the Earth's internal "nebula hypothesis", in fact, is wrong, it misleads "Earth Science."
because modern scientific research has found that the "polar radius" of the earth, about 1/300 shorter than the "equatorial radius", while the Earth's rotation of the "equatorial surface", the Earth's rotation around the sun", the "ecliptal plane" and the moon around the Earth's "white surface", these three, are not in a plane.
, that is, because of the three main factors: the gravitational forces of the moon, the sun and the planets, the "Earth's axis of rotation", in space produced a series of complex movements, which is also a wonderful law of the universe - the gravitational action of the contraction of celestial bodies.
and the Earth's movement, often referred to as "age difference" and "chapter movement".
so-called "age-difference movement", that is, when the Earth's axis of rotation, around the ecliptic axis, will depict a "cone" in space, and this roundabout week, about 26,000 years;
, the Earth's Earth's axis, always pointing to the North Star, and never changes, it is in the sun's orbit, the movement time is equal, the Earth and the sun will be equal "arc area."
we all know that the earth is now turning around at twenty-four hours, so why at this time? In fact, this is because the earth is at a speed of more than 100,000 kilometers per hour to "turn around the sun", and in the "around the sun" on the way, it will encounter the "solar wind" side thrust, so that the high altitude to produce such as "ion west wind circulation", and "high-altitude west wind" will promote the "ground west wind" and eastward surge of the "ocean current", and then promote the earth "from west to east" has been non-stop "rotation".
According to foreign media reports, since the birth of the earth 4.6 billion years ago, the day and day rotation, for the world to bring the rise and sunset of all things, until the sun in a few years later into a red giant, the earth swallowed up.
but then again, why does the earth spin? The earth is formed by a disk of gas and dust that surrounds the newborn sun.
in this rotating dust disk, the star-point dust and rock gravel gradually gathered together, gradually forming the Earth. Smadar Naoz, an astrophysicist at the
University of California, Los Angeles, explains that as the new Earth grows older, space rocks continue to collide with it, causing the Earth to begin to spin.
as almost all the matter in the early solar system orbited the sun in the same direction, and the Earth began to rotate in that direction as a result of these impacts.
but why did the solar system spin in the first place? Both the sun and the solar system are formed by the collapse of a cloud of gas dust that collapses under its own weight.
most of the gas coalesces into the sun, while the rest forms a disk of gas dust that rotates around the sun.
gas molecules and dust particles were moving around until they collapsed, but at a certain point in time, some of the gas and dust happened to move a little in a certain direction, causing the entire system to start spinning.
and when the gas cloud collapses, the gas cloud rotates as quickly as a figure skater can move faster after he clamps his arms and legs.
because there is nothing in space that hinders their movement, once they start to rotate, they keep spinning.
the nascent solar system has a huge angular momentum.
and the greater the angular momentum of the object, the easier it is to maintain the tendency to continue to rotate.
so when the solar system is formed, it is possible that all the planets will rotate in the same direction.
however, the direction of rotation of some planets has changed.
, for example, Venus spins in the opposite direction to Earth, while Uranus's axis of rotation is tilted by 90 degrees.
Venus may have been hit by a huge impact that caused the rotation to flip.
or it started in the same direction as other planets, but by the pull of the sun's gravity, coupled with the friction between Venus' core and the mantle, the rotation direction gradually reversed.
a 2001 study published in Nature, suggests that the gravitational pull between Venus and the sun and other factors may cause Venus to spin slower and eventually reverse its rotation.
uranus, scientists believe it may have hit a huge rock, or it may have been hit by a double impact on two celestial bodies, resulting in it hitting "looking up to the sky."
, despite that distinction, everything in space rotates in a certain direction.
" rotation is the basic behavior of objects in the universe.
," Naoz said.
, for example, asteroids rotate, stars rotate, and galaxies rotate (the solar system takes 230 million years to orbit the Milky Way, according to NASA).
the fastest-rotating object in the universe is pulsars, the remains of giant stars after they die.
some pulsars are the size of a city, but can rotate hundreds of turns per second.
one of the fastest, called Terzan 5ad, rotates 716 times per second.
black holes can even turn faster.
a 2006 study, a black hole called GRS 1915-105 can rotate 920 to 1,150 revolutions per second.
but the rotation of celestial bodies will gradually slow down.
Naoz says that when the sun first formed, it took 25 days to spin every four days.
this is because the sun's magnetic field interacts with the solar wind, causing the rotation to slow down.
is no exception even on earth.
the moon's gravity will cause the earth to gradually slow down.
an analysis of ancient solar eclipses in 2016 showed that the Earth's rotation rate has slowed by about six hours in the past 2,740 years, equivalent to an increase of 1.78 milliseconds per century.
so the sun will still rise tomorrow, just a little later.
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