MARS

Therefore, for further comparisons, we must turn to our planetary system, representatives of which shine by reflected sunlight. As for the four outer planets - Neptune, Uranus, Saturn and Jupiter, the latter is not entirely true, recent studies have shown that these planets to a small extent, seems to possess its own light, they are in a slightly heated condition. You can not with any certainty say they represent are gaseous, solid or liquid mass, but in any case no doubt that their density is low. The atmosphere of these planets we have said in the chapter on spectral analysis, and even earlier in the description of the famous rings surrounding Saturn. Briefly mention here a kind of striped spots covering most of the surface of Jupiter. First thought of their education as clouds, but lately Barnard, on the basis of long-term observations, came to the conclusion that the surface of this planet is in a plastic paste-like state. Bands should be attributed to color changes that occur due to internal eruptions. If only this hunch is confirmed, then Jupiter will serve as an example of an ancient slowly descending sun. On numerous asteroids can say little: the greatest of them, especially on tracks for an open atmosphere. The huge interest is the observation of planets lying in the asteroid belt, and especially over Mars. Venus and Mercury, whose orbits lie between the Sun and Earth, have been less studied. Mars, the extreme of the four planets closest to the Sun, has two small satellites. The average distance him from the sun reaches 31 million miles: it is a little more than half the average radius of the Earth's orbit, so Mars receives from the Sun is almost twice as much heat and light than the Earth. Ekstsentritsitet its orbit is relatively large: Mars is approaching the Sun at 28 million miles away and removed from it by 33 million miles, it reaches a diameter of 909 miles, slightly larger than the Earth's radius. Its rotation around the Sun Mars does in 687 days, and about the axis in 24 hours 37 minutes and 24 seconds.