1.First cosmic speed
(also known as the surrounding speed): refers to the speed at which the object is close to the surface of the earth for circular motion (also the minimum launch speed of the artificial earth satellite). The size is 7.9km/s - the calculation method is V = √(gR), which is V = sqrt(gR) (g is the acceleration of gravity, R is the radius of the planet)
2. Second cosmic speed
(also known as the speed of separation): refers to the minimum initial speed required for an object to completely get rid of the gravitational pull of the Earth and fly away from the Earth. The size is 11.2km/s
3. Third cosmic speed
(also known as escape speed): refers to the minimum initial velocity required for an object launched on Earth to escape the sun's gravitational force and fly out of the solar system. Its size is 16.7km/s.
4. Fourth cosmic speed
The so-called fourth cosmic speed refers to the minimum initial velocity required for the objects launched on the earth to get rid of the galaxy's gravitational force and fly out of the galaxy, about 110-120 km/s, which refers to the speed required for navigation in most places in the Milky Way. . If you make full use of the speed of the solar system around the center of the silver, the minimum speed can be 82km / s. Since humans know little about the galaxy, this figure will take a long time to form a public opinion. Refers to the speed of detachment required in most parts of the Milky Way. The speed of the fourth universe cannot be obtained at all because the quality and radius of the silver core cannot be valued.
5. Fifth Cosmic Speed
The fifth cosmic velocity refers to the minimum velocity of the spacecraft launched from the earth and flying out of the local group of galaxies. Since the radius and mass of the galaxies are not sufficiently accurate, the data size cannot be accurately known.