To be sure, the universe is vast and vast. But when objects or distances are large enough, we often lose concept of their size because there is nothing to refer to. However, for a long time, humans have been trying to show a sense of reality in some way. Here is Unveiled, and we will answer this unusual question today: What is the true scale of the universe?
The first difficulty in measuring the universe is the way it is measured. Because there are so many metrics, determining the "size" of any object in space is quite difficult. You can measure the mass, volume, or diameter of an object, but each item will show a different result. For example, black holes have a very large mass, but their diameter is not large enough to correspond to them. The massive black hole Sagittarius in the Milky Way has a diameter of 30-40 times the diameter of the Sun, which, although large, is also much smaller than the diameter of many more massive stars. In contrast, stars have much less mass but are "scattered" over a wider space, which makes the star appear larger.
In this video, we mainly determine the size of celestial bodies from their diameters. Earth is the largest of the four inner planets in the solar system, though it is only about 400 miles larger in diameter than its "twin brother, Venus." Mars and Mercury are much smaller , with Mercury only about the size of two Pluto stars in diameter. Keep in mind that Pluto's small size was one of the reasons it was identified as a dwarf planet in 2006. Mars is about 4212 miles in diameter, and it's more than 3,700 miles smaller than Earth.
The Moon is about 2200 miles in diameter, which is larger than Pluto's, but can still maintain its current position. Interestingly, the Pacific Ocean alone is large enough to hold the entire Moon. In terms of distance, the Moon is clearly the closest object to us, but still has a distance of 238,855 miles. If the size of the Earth is compared to a tennis ball, the Moon is about seven feet away from it.
In our solar system, the largest planet is called a gas giant; the largest known planet is Jupiter. Jupiter is about 87,000 miles in diameter, that is, it is more than 1,300 times larger than Earth.
Although gas giants are huge in size, their density is very small. This is also why the public would say (though not entirely accurately) that if we had enough bodies of water to accommodate Saturn, Saturn would float on water.
However, it's not common for gas planets to expand to such a large volume — more interesting is the world of large, rocky planets.
Kepler 10c, one of the known giant planets of this type, was discovered in 2011; it's 17 times larger than Earth's. There's also the fascinating BD+20594b discovered in 2016, twice the size of Earth.
Planets like this are classified as giant earth-like planets. But in the long run, planets aren't the largest objects in the universe.
Stars are usually the largest monomers. Our Sun is the largest known object in the solar system, but it is still not the largest compared to other stars. The largest planet we have discovered so far is UY Scuti. It is 1700 times the diameter of the Sun, but it has only 30 times the mass of the Sun.
The largest star besides the Sun is Sirius. It is also called "Dog Star" in English. ）。
The heaviest star, however, is neither UY Shield nor Sirius; it is a blue dwarf, currently named R136a1, with a mass 315 times that of the Sun.
Now let's zoom out and look further afield. A galaxy made up of billions of stars and planets is one of the largest structures in the universe.
Our Milky Way is thought to be a medium-sized galaxy with a diameter of at least 100,000 light-years. So far, we've only found thousands of galaxies in the Milky Way. But scientists predict that there should be billions of galaxies in the Milky Way that remain undiscovered.
Using data mainly from Hubble's observations, scientists predict that there are between 10 billion and 20 billion galaxies in the visible universe. The smallest of these has a diameter of only 3,000 light-years and the largest galaxy has a diameter of more than 300,000 light-years. Located more than 2.5 million light-years from the Milky Way, the Andromeda Galaxy is the closest "other galaxy" to us. Interestingly, in about 4.5 billion years, when Earth is twice the age of today, the Andromeda galaxy and the Milky Way could collide with each other and merge into one giant galaxy — what some scientists now call "Milkdromeda." In reality, however, it's unlikely that we'll see these distant planets, stars, or galaxies up close, because anything in outer space is vastly spaced apart. Humans have never even been to another planet in the solar system, but even the solar system is a very small existence in the vast cosmic system.
The solar system's radius is about 1.87 light-years, and one light-year equals about 5.88 trillion miles, which means that even light travels out of our star system in nearly two years. But, in general, the solar system is too small to actually measure it in terms of "light years"; instead, we use astronomical units, 1 astronomical unit equivalent to the average distance from the Earth to the Sun, about 93 million miles. The distance from the Sun to the far edge of the solar system is 100,000 astronomical units, but our nearest next star, Proxima Centauri, is more than 268,000 astronomical units, or 4.2 light-years, more than twice that distance.
In 2015, the New Horizons probe arrived on Pluto after a journey of more than nine years... That is, if we continue to move forward at this rate, we will reach Proxima Centauri in about 55,000 years! In the highest estimate, modern humans have existed on Earth for only 300,000 years. So we need one-sixth of the time of the entire human history to complete a one-way trip to the nearest star system in billions of star systems throughout the universe. What's even crazier, however, is that all of these objects—planets, moons, stars, and galaxies—are the only ones we can see in the known universe.
The real universe is so vast that the light from the Big Bang has not yet reached every corner of the universe, even though it has been spreading for nearly 14 billion years. A study conducted in 2011 by a team at the University of Oxford suggested that the real universe could be even 250 times larger than what we can currently observe... That means it's probably seven trillion light-years in diameter! But because the universe is expanding, the universe may have become much larger long ago when the range of seven trillion light-years could be observed—that is, light reaching so far away.
Finally, when you think that only five percent of what we can see and understand, and what remains is dark matter and dark energy, then the amazing entity we are dealing with is really famous. The space of the universe is larger than we understand it, but it still continues to grow, and this is the true scale of the universe, you think? Are we missing something? Let us know in the comments, take a look at other videos posted on the public web, and make sure you've followed us and turned on our updates
Dark matter is a hypothetical form of matter that people generally assume that 58% of the matter in the universe is dark matter. Many observations of astrophysics, including gravitational effects, imply the existence of dark matter unless there is more matter than we cannot see. It is precisely because most scientists believe that dark matter accounts for a very large proportion of the universe, and its structure and evolution also have many effects, dark matter is called "dark" because it does not seem to interact with any electromagnetic field, which means that he not only does not absorb, does not reflect, but also does not emit electromagnetic radiation, just like light, so it is difficult to detect.
The most important evidence for dark matter comes from calculations that show that many galaxies will separate without forming, or that they will not move at will if they do not contain large amounts of unseen matter. Some other evidence of finger-holding includes observations of gravitational lensing and cosmic wave light backgrounds, as well as astronomical observations of the current structure of the universe, the formation and evolution of galaxies, most observable. The mass positions generated by galactic collisions and the motion of galaxies within a galaxy cluster, in the standard Lambda-CDM model of cosmology, the energy content of total matter in the universe contains 5% ordinary matter and energy, 27% dark matter and 68% dark energy. So, dark matter, which accounts for eighty-five percent of the total mass/energy, while dark energy and dark matter account for 95% of the total mass-energy content.
Because dark matter has not yet been directly observed, it is assumed that it exists, except through gravity, otherwise, he can hardly interact with any baryonic matter and radiation, mostly dark matter, is considered to be non-baryons, he may have some undecolar subatomic particle composition. The main selected example of dark matter is a new type of elementary particle that has not yet been discovered, especially massive particles with weak interactions. Many people's experiments directly detecting and studying dark matter particles are actively underway but are not currently successful. Dark matter is divided into cold, warm, and hot according to its speed, more precisely, its free-flow length. Current models are more inclined to the case of cold dark matter, whose structure is formed by the gradual accumulation of particles.
by : Unemployed Vagrant, Mizuki, Edamame Whipped Cream Kikufuku, ilmomyearl2