How big is the solar system? Detailed answer

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How big is the solar system? Detailed answer

Big encyclopedia for children and adults

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How big is the solar system?

Compared to other planets, our Earth is located quite close to the Sun, although it is not the closest to it. The average distance from the Earth to the Sun is about 150 million kilometers, or, as astronomers say, one astronomical unit of length.

The average distance from the Sun to Pluto, which until recently was considered the most distant planet from the star, is approximately 40 astronomical units, or almost 6 billion kilometers. Beyond the orbit of Pluto lies a giant cometary Oort cloud, extending within a sphere with a radius of 100-150 thousand astronomical units, or 15-22 quintillion kilometers (a quintillion is a billion billion).

In order to visualize the scale of the solar system more clearly, let us turn to its model given by IS Shklovsky in the book "The Universe, Life, Mind". Let the Sun be represented by a billiard ball with a diameter of 7 centimeters. Then the planet closest to the Sun - Mercury is located from it (on this scale) at a distance of 2,8 meters, the Earth - at a distance of 7,6 meters, Jupiter is removed at a distance of about 40 meters, and distant Pluto - at a distance of about 300 meters. On this scale, the radius of the Oort sphere would be about a thousand kilometers.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

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Some species of toad-like lizards, in case of extreme danger from a predator, use a unique protective mechanism: they shoot at it with their blood from the corners of their eyes at a distance of up to one and a half meters.

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Anti-clot magnet 28.04.2015

Usually, to remove a blood clot, the tPA protein, a tissue plasminogen activator, is injected into the blood vessel. This substance is normally present in the blood, contributing to the destruction of fibrin fibers. Thus, its addition increases the rate of resorption of blood clots.

However, the dose introduced into the vessel is quickly distributed throughout the circulatory system, and only a small part of the thrombus reaches it. It would seem that you need to increase the dose, but if you overdo it, bleeding may occur.

A safe alternative is offered by researchers from the Houston Methodist Research Institute, led by Dr. Paolo Desuzzi. They were able to pack the tPA protein, together with magnetic iron oxide nanoparticles, into a shell of another blood protein, albumin. This package provides a triple advantage.

Firstly, it is easy to concentrate magnetic particles exactly at the site of thrombus formation.

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