What is the size of the largest known meteorite crater in the solar system, and where is it located? Detailed answer

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What is the size of the largest known meteorite crater in the solar system, and where is it located? Detailed answer

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What is the size of the largest known meteorite crater in the solar system, and where is it located?

The largest known meteorite crater, Valhalla, is located on Callisto, a moon of Jupiter.

It has a bright central region about 600 kilometers in diameter and a system of concentric ridges extending 1500 kilometers from the center of the crater.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

Who came up with the notes?

Who invented the musical staff - five horizontal rulers, on which musical signs were placed? It happened at the beginning of the XI century. Then the Italian monk Guido d'Arezzo - Guido Aretinsky (992-1050), a musician and singing teacher from the city of Arezzo - drew the very first rulers, along which, like steps, musical signs ran up and down. True, at first there were not five lines, but four, and they were all of different colors.

Such signs-symbols became known as notes. Notes (from the Latin "notatio", which means "writing, designation") began to be placed both on the lines themselves and between them. The notes look like small oval heads. The duration of the sound is indicated by a white or black note head, and by the location of the note on the stave, you can determine its height.

The notes had to be named somehow. To make it easier to remember the names of sounds, Guido ordered his chorister students to learn a hymn-prayer in honor of St. John, who was considered the patron saint of church singers. For this prayer, Guido composed a new melody, in which each subsequent line of poetry began a step higher than the previous one. And each first syllable of a new line became the name of a new note. So the notes got their first name: Ut, Re, Mi, Fa, Sol, La - according to the initial syllables of the first six words of the hymn-prayer.

Over time, the syllable Ut was replaced by the syllable Do, and the name for another sound-note appeared - Si, made up of the first letters of the phrase Sancte Iohanne - St. John. This is how the first international language appeared - the language of notes, which is now understood by all the musicians of the world: DO - RE - MI - FA - SOL - LA - SI.

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