If numbers are the bricks on which the building of mathematics is built, counting is the fundamental tool that made that construction possible

First-degree equations, i.e., equations whose variables have exponents of degree not higher than the first, are also called linear equations because, when they have two unknowns, the set of their solutions forms a straight line in the Cartesian plane

The slope of a line is its inclination with respect to the abscissa axis and is given by the ratio between the variation in y and the variation in x

A Doodle celebrating the birthday of Carl Friedrich Gauss, issued by Google on April 30th, 2018

One of the greatest mathematical geniuses who ever lived was undoubtedly the German Carl Friedrich Gauss, born in Brunswick in 1777 and died in Göttingen in 1855

Numbers you can read indifferently in one direction or the other, such as 11, 121, 939, etc., are called palindromes

Mathematics is the science of numbers. There would be no mathematics, with all its varieties (arithmetic, algebra, set theory, probability theory, etc.), if there were no numbers to manipulate. But what is a number?

[immagine di mox_draws]

La relatività generale, la migliore teoria di cui oggi disponiamo per descrivere la gravità, si basa su una matematica complessa, la cui piena comprensione richiede competenze professionali. Ma le geniali intuizioni che sono a fondamento della teoria pubblicata da Einstein alla fine del 1915 sono accessibili a chiunque, grazie all’aiuto illuminante di alcuni esperimenti mentali

Dalla relatività speciale alla relatività generale

  • le leggi fisiche, a cominciare da quelle della meccanica, sono valide in tutti i sistemi di riferimento inerziali [1];
  • la luce si propaga nel vuoto a velocità costante indipendentemente dallo stato di moto della sorgente o dell’osservatore.

A spectacular view of the Andromeda galaxy [Robert Gendler]

The two large spiral galaxies will eventually collide in five billion years or so, according to calculations based on data published in the second release of the Gaia astrometric satellite catalog. But it won’t be a head-on collision

The galactic center, imaged in infrared by the Spitzer space telescope [NASA/JPL-Caltech]

At the center of the Milky Way hides a four-million solar mass black hole. The confirmation of its existence, which took place thanks to the study of star orbits conditioned by its immense gravity, earned the Nobel Prize 2020 for physics to Andrea Ghez and Reinhard Genzel. But the story of the observations that led to the discovery of this supermassive black hole begins in the 1950s and deserves to be told

A powerful radio source towards the Galaxy’s darkened center

Dimensions compared between Betelgeuse and the Sun (simulation)

A new study recalculates the main parameters of Betelgeuse based on a triple series of astrophysical simulations. The result is that the red supergiant seems to be a little less gigantic than indicated by previous calculations and a little closer

Michele Diodati

Science writer with a lifelong passion for astronomy and comparisons between different scales of magnitude.

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