The universe is huge. It is difficult for us to imagine its true size. Scientists say that since the Big Bang, it has grown so much that it has virtually no margin. We cannot see the whole Universe, but those places that are open to our view also contain many secrets, riddles and other unusual things. In the past we have already written about the largest structural objects in the Universe. Today we will talk about singles: starting from the largest asteroid and ending with the largest galaxy in the visible space of space.
Reference: One light year is a measure of distance in astronomy, equal to the distance that light travels in a vacuum in one earth year.
The largest asteroid in the solar system
Previously the largest asteroid of the solar systemwas Ceres. The diameter of the object is about 950 kilometers. The second in size was considered Pallas with a diameter of 512 kilometers. And Vesta occupied the third line of the largest of the known asteroids of the Solar system, being smaller in size than Pallas, but overtaking it in mass.
After scientists transferred Ceres to dischargedwarf planets, Pallas began to occupy the top line of the largest (in size) asteroids in the solar system. However, astronomers clarified the size of Vesta and it turned out that it is larger than Pallas. The diameter of Vesta is 530 kilometers. Thus, Vesta became not only the largest, but also the most massive asteroid of our solar system.
See also: Is the universe finite or infinite?
The largest satellite of the planet in the solar system
The relative size of Ganymede with other satellites of the Solar system and the Earth
The satellite of the gas giant Jupiter Ganymede is the largest satellite in the solar system. Its diameter is 5268 kilometers.
Ganymede is one of the four largestthe moons of Jupiter, which, along with Io, Europa and Callisto, were first discovered by the Italian mathematician, philosopher and astronomer Galileo Galilei. The name Ganymede was not used until the mid-20th century. Galileo called the satellites discovered by him “the Medici planets”, and Ganymede himself called Jupiter III or “the third satellite of Jupiter”.
Scientists believe that under the surface of Ganymede there is a huge ocean, the water which contains much more than on Earth.
See also: Scientists have named the approximate birthplace of Jupiter
The largest exoplanet satellite
The star WASP-12, located 870 light-years away from us, has an exoplanet WASP-12b. Recall that exoplanets are called planets that are outside the solar system.
In 2012, the planet WASP-12b exploredRussian scientists. They assumed that she had a satellite. This possibility was based on an analysis of the brightness (brilliance) of the star. By the peculiarities of the brightness changes, it is possible to calculate how much of the area of the star’s disk the satellite covers. Scientists believe that the satellite has a radius of 0.57 radius of Jupiter (it is 6.4 times the size of the Earth). Such a large size and suggested the existence of a satellite.
The largest planet in the solar system
With a diameter of 142,984 kilometers, Jupiter is the largest planet in the solar system. Along with Saturn, Uranus and Neptune, Jupiter is classified as a gas giant.
The mass of Jupiter is 318 times the mass of the Earth. It is 2.5 times heavier than all the other planets of the solar system combined. The giant is located at a distance of about 770 million kilometers from the Sun and makes a complete revolution around the star in about 11.9 Earth year.
Perhaps the most famous feature of Jupiter is its Great Red Spot (BKP) - a hurricane that has been going on for more than 300 years on the planet. The diameter of the Spot is greater than the diameter of the Earth.
The largest stony exoplanet
Artistic representation of the planet BD + 20594 b
The largest stony exoplanet wasdiscovered by the Kepler space telescope in 2016 in the constellation Aries, which is 500 light-years from us. The object, which received the designation BD + 20594b, is about 16 times heavier than the Earth and has a radius 2.2 times that of the earth.
Previously the largest stony exoplanetWas considered Kepler-10 c. Studies said that this planet has a radius that is 2.35 times the Earth’s, and its mass is about 17 more than that of the Earth. However, more accurate calculations carried out in 2017 made it possible to establish that the planet Kepler-10c is only 7.4 times heavier than the Earth, and its composition is closer to the gas giants.
The largest gas giant outside the solar system
Determine the largest exoplanet classgas giant - not an easy task. Scientists need to consider a lot of things. For example, in space there are objects so huge that they can hardly be called planets. They are more like a star. At the same time, their mass is less than the minimum necessary to maintain nuclear reactions of hydrogen combustion and transformation into a star. Such objects are called substellar.
Presumably the biggest exoplanetThe class of gas giant among those detected at the moment is HD 100546 b, opened in 2013. It is located 337 light years from Earth. Scientists believe that HD 100546 b is 6.9 times larger and 20 times heavier than Jupiter.
The biggest star in the universe
Currently, the biggest star is not onlyin our galaxy the Milky Way, but also in the known universe is the red hyper giant UY Shield. It is about 9,500 light years away. According to scientists, the radius of the UY Shield is equal to 1708 the radii of the Sun, but it is constantly changing and can reach 2100 solar radii. The diameter of the star is 2.4 billion kilometers.
The size of our Sun and UY Shield stars (with a magnification of 7 times)
For understanding: if the Sun is drawn with a small circle with a diameter of 1 mm, then for UY Shield a circle with a diameter of 1.7-2.1 meters will be needed! If you place the UY Shield in the center of the Solar System, then its photosphere (the radiating layer of the stellar atmosphere) will cover the orbit of Jupiter.
According to modern astronomers, UY Shield's star is 340,000 times brighter than our Sun.
See also: Scientists have told which planets have a chance to survive the death of their star.
Biggest black hole
If you believe this information, about 17billions of light years away, in the direction of the constellation Virgo, there is a quasar with the supposedly most massive black hole in the known universe. The object is very complex name SDSS J140821.67 + 025733.2. It is located in the direction of the constellation Virgo.
The mass of an SDSS object J140821 easily builds it intorank of ultramassive black holes. The value of this parameter is almost 3 times the mass of the leading to this ultramassive black hole of the quasar TON 618, whose figure is 66 billion solar masses. By the way, scientists recently proposed an idea explaining how such supermassive black holes could even appear in the Universe.
See also: 10 scientific facts that we learned from the first photo of a black hole
The largest galaxy in the universe
The mass of the new leader is 196 billion solar masses. Its diameter is 1.17 trillion kilometers. This is more than 98 times the diameter of the Pluto orbit in the solar system.
Largest in size (but not in mass)The galaxy in the observable universe is a galaxy with the inconspicuous name IC 1101. Its diameter is about 6 million light years. In other words, it takes 6 million years for the light to travel from one edge to another. Its size IC 1101 is due to numerous collisions with significantly smaller galaxies.
Galaxy IC 1101 is located approximately in onea billion light years from us. It contains about 100 trillion stars. For comparison: in our Milky Way galaxy can contain from 200 to 400 billion stars.
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