The Jupiter

The Jupiter is a giant among the planets. The diameter of its equator is more than 10 times greater than the earth's, but the polar diameter is noticeably smaller: Jupiter has significant compression. This can serve as an indication of a large value of the speed of rotation around its axis; day on Jupiter last less than 10 hours, the year, on the contrary, about 12 Earth years. Jupiter has a mass of 318 times more terrestrial, and the force of attraction is 2.7 times greater than on Earth.

The Jupiter is a giant among the planets

The Jupiter retains a dense atmosphere. The temperature, according to the measurements, is about -130 degrees Celsius (on the side facing the Sun), since the solar radiation reaching to it due to the huge distance is much less than that which reaches the Earth.

The surface of the planet Jupiter can not be directly observed because of a dense layer of clouds, however, the latter is an interesting picture. Despite constant changes, it is almost always possible to distinguish several reddish brown strips parallel to the light equatorial belt of Jupiter. Along with this, more or less large dark spots often appear, one of which attracts the observer's special attention - the so-called Great Red Spot. This oval formation of more than half a million square kilometers was discovered about 120 years ago in the southern hemisphere of the planet Jupiter. Since then, it has changed in size and color and is now visible in most cases as a white cloud.

The satellites of the planet Jupiter (not to mention the Moon) were the first satellites seen by man. In 1610, the Italian astronomer and physicist Galileo, first with the help of a self-constructed telescope, observed four bright glowing points near the disk of the planet Jupiter. The change in the position of these "stars" very soon led him to the conclusion that he was dealing with the satellites of the planet Jupiter. Later, besides these, eight more satellites of Jupiter were discovered, much weaker than the first four.

Four bright satellites: Io, Europe, Ganymede and Callisto - have an impressive magnitude. Ganymede is even larger than Mercury. Using the eclipse of the first satellite of Jupiter - its entry into the cone of the shadow of Jupiter - O. Remer almost 300 years ago determined the speed of light. Invariably interesting is the observation of the changing position of the satellites of Jupiter. For several hours, there have been significant changes in their configuration.