Curiosity's radio contact with Earth April will be blocked

The relative positions of Mars and Earth in the April are shown in the following illustration:

As can be seen from the above picture, this April, Mars, the Sun and the Earth three in a straight line. Both Mars and the earth rotate in counterclockwise direction. At present, the two are about 350 million kilometres apart. In this extreme case, the radio signals sent to Earth by Mars will be strongly disturbed by the solar electromagnetic field. This is called the "Marssolar conjunction" ("Rendezvous" between Mars and the Sun), which occurs about 26 months. This phenomenon will take place from April 9 to April 26 this year.

What does this have to do with pocket electronic books? In retrospect, in 1831, M.faraday (Faraday) discovered electromagnetic induction, and 1864 J.maxwell (Maxwell's) attributed all electromagnetic induction to a differential equation (i.e. Maxwell's equation) of 4 multivariate functions, thus predicting the existence of electromagnetic waves; May 7, 1895, A.popov (Popov) invention Radio (Radio) transmission device, communication distance of only 550 meters. Over the past 100 years, the ability of humans to communicate "wirelessly" through electromagnetic waves has expanded to 350 million kilometers, expanding nearly 600 million times times.

The Maxwell's equation is as follows:

In fact, the first two equations are the divergence and curl of the electric field, and the latter two equations are the divergence and curl of the magnetic field. These are examples of the Gauss and Stokes formulas of the pocket-book multiple integrals, but they are not yet mentioned.

Here, what I want to say is: The discovery and application of electromagnetic wave can not be separated from the inference of the Maxwell's equations, inseparable from the multivariate calculus, without the vector analysis, inseparable from the structure of the real number system, without set theory. Mathematics is not omnipotent, but it is impossible to leave the maths. Now the world has entered the mobile internet era, the mathematical pocket of electronic books can be "cloud storage" through the Internet, floating and readily available.