People from ancient times looked at the sky and stars, predictions were made on them, location was determined, etc. Scientists are working on the study of planets and stars. Which planet is the smallest?
Planets smaller than Earth
You can compare the Earth with other planets entering the solar system. Significantly smaller than our planet - Mercury. From the sun it is the first planet. It is rather difficult to see it, which is connected not so much with its miniature size, as with a small angular distance to the Sun. Scientists were able to compile its full map only in the 2009th year, while they were based on images of the devices "Messenger" and "Mariner-10." The radius of this small planet is 2439.7 ± 1.0 km.
Pictures of the smallest planet in the solar system were taken using this Mariner 10
Venus is almost the same as the Earth in size and mass. From the earth's mass, its mass is 0.815. It is known that the revolution around the Sun is performed by it in almost two hundred and twenty-five terrestrial days.There is water there, but it is much smaller than on Earth. After the Moon and the Sun in the sky of our planet, Venus is the third brightest star. The following is known about it - the temperature of the surface is over four hundred degrees, the extremely high density of the atmosphere, the absence of satellites. With all the apparent similarity of the planet with the Earth, they have too many important differences. The surface of Venus is not possible to see due to the fact that it is covered with dense clouds consisting of sulfuric acid. These clouds have great reflective properties. The relief was investigated only due to radio waves.
Venus and Earth have similar dimensions.
Planetology as a science suggests that most likely at one time on the planet were oceans, similar to those that now exist on Earth. This planet has been little studied, despite the fact that its surface was not studied by a single spacecraft. It should be noted that none of them worked for more than two hours due to difficult conditions. It is thanks to these spacecraft that they first made pictures of the surface of this planet on Earth. This happened in the 1975th year.
Comparative dimensions of the planets of the solar system
Another planet that is much smaller when compared with Earth is Mars. It received its second name “red planet” because of its presence on the surface of iron oxide. She was given a name in honor of the ancient Roman god of war. She has two natural satellites, called Deimos and Phobos. The study of the "red planet" scientists are engaged in many countries. According to them, it may be water, but it is not in a liquid state, which is associated with too low pressure on the surface. Such a conclusion suggests that primitive life on the planet may well exist.
Mars is much smaller than Earth
Thanks to research and work of the rovers, the scientists found out that the surface was once covered with water. The climate on the planet is seasonal, the average temperature is minus fifty degrees. Man can easily see Mars, even with the naked eye. It is known that its mass is less than eleven percent of the Earth’s mass.
The smallest planets in the solar system
For a long time, Pluto was considered a record-breaking planet in the Solar System.However, it was no longer called the planet in 2006, in other words, it lost the status of a planet. This is due to the fact that by that time many objects had been discovered that were significantly larger than the size of Pluto. Now, deprived of the status of a planet, it has become one of the minor planets and is listed in the number 134340 of the catalog of the Central Minor Planets. The time has passed, but not all scientists have agreed with this, some still continue to believe that this planet should be returned to its previous status.
Pluto is quite small. Scientists can not agree on whether this planet
Officially, today, the planet with the name Mercury is considered the most miniature planet of our solar system. It moves much faster than other planets, most likely because of this it is given such a name. After all, as you know, the god of commerce Mercury was swiftly. Its weight is 3.3 • 1023 kg. Relative to the mass of the Earth, the mass of Mercury is 0.055. Given the density, it can be argued that in its depths contains a lot of metals. This small planet revolves around the sun in eighty-eight terrestrial days.
The smallest planet of the solar system - Mercury
Mercury is very little studied, but it is known that he has no satellites. Among its famous features, there are numerous jagged ridges and impact craters.
The smallest planet of the galaxy
Some twenty or thirty years ago, it was reliably known only about our solar system in the galaxy. About the fact that somewhere outside our system there is an almost infinite number of planetary systems of other stars, scientists could only make assumptions.
In the Milky Way galaxy there are planets of different sizes.
The name of our Galaxy is the Milky Way. To date, it is not possible to estimate the total number of planets in it. Knowing that the Milky Way is hundreds of billions of stars, we can confidently say that the Galaxy contains at least hundreds of billions and even trillions of planets. From this huge number of celestial objects of the Galaxy, an extremely small number of objects have been studied. In this regard, it is impossible to say which of the planets is the smallest there.
The beauty of large and small planets
It remains to be content only with what is already known about our solar system, namely, that Pluto was the smallest planet before 2006, and now Mercury has taken its place.
Meanwhile, is in the constellation Hercules. According to uznayvse.ru, it was opened quite recently, in 2006, the year.
The smallest planet of the galaxy image, picture, imagery