What is the gravitational radius and how large are its values for various objects? Detailed answer

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What is the gravitational radius and how large are its values for various objects? Detailed answer

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What is the gravitational radius and how large are its values for various objects?

The gravitational radius is the radius of the so-called Schwarzschild sphere, on which the gravitational force created by the mass located inside this sphere tends to infinity.

The gravitational radii of ordinary celestial bodies are negligible: for the Sun, the gravitational radius is 2,96 kilometers, for the Earth - 8,86 millimeters, for the Moon - 0,1 millimeters. For a very massive star (giant or supergiant), the gravitational radius can be several tens or hundreds of kilometers.

If the body is compressed to a size smaller than its gravitational radius, then no radiation or particles will be able to overcome the gravitational field of this body and escape from under the Schwarzschild sphere to a distant observer. Such objects are called black holes.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

Which weapon has killed more people in its manufacture than in its use?

Nazi Germany spent a lot of resources on the development and production of the world's first long-range ballistic missiles V-2, but their combat effectiveness was very weak. Rocket factories made extensive use of concentration camp labor under harsh conditions, and it has been established that more people died in the production of V-2 rockets than from bombing with these weapons.

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Reducing the altitude of aircraft will help the environment 19.02.2020

A group of scientists from the British Imperial College London and the German Institute of Atmospheric Physics proposes to adjust the flight altitude of individual flights in order to reduce the impact of the contrail on global warming.

Behind each flying aircraft, a contrail is formed, consisting of a dense layer of small ice crystals that do not dissipate for tens of hours and prevent heat from being reflected from the Earth. Contrails are especially harmful at night, when they return the heat reflected from the surface back.

Using data collected by the Japanese authorities from 2002 to 2013 on the movement of aircraft, scientists have found specific altitudes at which flying liners leave the most persistent contrails. To get rid of them, it is necessary to change the flight altitude of aircraft - even taking into account the increase in fuel consumption and the level of emissions of carbon dioxide and other greenhouse gases, the effect on nature will be positive.

The authors of the study emphasized that a relatively small proportion of flights, which predominantly take place in the afternoon, will undergo height adjustments. If the proposed measures are implemented, the effect of contrails on global warming will decrease by 91%, aviation will reduce its harm by 56%.

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