How many moons does Jupiter have? Detailed answer

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How many moons does Jupiter have? Detailed answer

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How many moons does Jupiter have?

Now that we are all reading about spaceships and outer space travel, there is a growing interest in other planets in the solar system. With the possible exception of Mars, the most interesting planet for us is probably Jupiter. First of all, Jupiter itself is like a miniature solar system! At present, at least sixteen satellites, or moons, have been discovered orbiting Jupiter. Four of them are close in size to our Moon. Two of them are only about 30 miles in diameter, and some are just dwarfs! Their diameter is about 15 miles or less! Jupiter is the largest of all the planets, and its volume is 1300 times that of the Earth.

If you look at it with the naked eye, it will be a bright and beautiful sight, although it does not approach the Earth closer than 367 miles! Astronomers studying Jupiter with telescopes see an ever-changing picture. On its surface there are stripes, or belts, separated by bright spaces called zones. The belts do not have a clear outline, but constantly break up into irregularly shaped areas of various kinds. The zones also change from time to time, and dark spots and bright white areas suddenly appear in them.

Astronomers believe that what we see as belts or zones are actually accumulations of clouds or vapors, which are often turbulent. One of Jupiter's oddities is that striking colors often appear on its surface. The two belts vary in color from very red to brown, gray or even bluish. It is believed that this is somehow related to the revolution of Jupiter around the Sun. One revolution takes 12 years, and color changes seem to occur at a frequency of exactly 12 years.

Perhaps the most interesting and remarkable thing about Jupiter is its huge red spot. It is about 30 miles long and about 000 miles wide. It is subject to strong changes in color, shape, brightness and mobility. In some years it may be brick red, at other times it may be gray, and sometimes it seems to disappear altogether. In addition, this mysterious red spot seems to be moving, as if drifting on the surface of Jupiter.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why are we fooling everyone on April 1st?

The origins of some traditions, customs, holidays are difficult to trace. We try and fail to explain where they came from. The origin of the April Fool's tradition is explained in different ways. A similar day exists in almost all parts of the world. On this day, they make fun of friends and acquaintances, sending them on stupid assignments or forcing them to do stupid things.

It is believed that this tradition comes from France. When the calendar was changed, the first country to adopt it was France. Charles IX ordered in 1564 that the year should begin on 1 January. And before that, the New Year holidays and the change of year were associated with April 1. After Charles introduced this decree, the New Year began to be celebrated on January 1st.

But there were people who resisted such a change and refused to follow it. The others laughed at this. They did it in the following way: they sent joking gifts, came to visit them, invited them to their place so that, jokingly, they would all celebrate the arrival of the New Year together - and all this on April 1. In other words, it was the April Fools who celebrated the arrival of the New Year on April 1st. So, the custom of fooling someone on this day began with comic gifts and comic congratulations of these people.

Test your knowledge! Did you know...

▪ How did the Parisian press react to the return of Napoleon from the island of Elba?

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In armor for a run 20.06.2012

The English physiologist Graham Askew of the University of Leeds borrowed XNUMXth-century knightly armor from the Royal Armories, dressed four healthy young volunteers in them, and sent them on a treadmill.

The armor weighed 30 - 50 kilograms, only the protection of the legs (greaves) and steel shoes with pointed ends, with which the knight could kick the enemy, weighed 7 - 8 kilograms. At different track speeds, the subjects measured their pulse and respiration rates, oxygen consumption, and stride length.

It turned out that 1,9 times more energy is spent on running in armor, and 2,32 times more on walking than without armor. Curiously, oxygen consumption did not increase, as the tight steel bib made it difficult to breathe. Heavy armor was also worn on knightly horses.

Askew would like to do similar research with a horse, but is wary of introducing an armored horse into his lab full of precision instruments.

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