Сколько планет-гигантов есть в Солнечной системе?
There are hypotheses about the existence in the outer region of the planet Tyche and, possibly, any other "Planets X", as well as the satellite star of the Sun Nemesis. The four giant planets, also called gas giants, together contain 99% of the mass of matter that orbits the sun. Jupiter and Saturn are predominantly made up of hydrogen and helium; Uranus and Neptune have more ice in their composition. Because of this, some astronomers classify them in their own category - "ice giants". All four giant planets have rings, although only Saturn's ring system is easily visible from Earth. Jupiter has a mass of 318 times that of the earth, and 2.5 times more massive than all other planets,
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