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Sucheta Rampure

Roll No.18

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Neptune, though slightly smaller than Uranus, is more massive and more dense. It radiates more internal heat, but not as much as Jupiter or Saturn. Neptune has 14 known satellites. The largest, Triton, is geologically active, with geysers of liquid nitrogen. Triton is the only large satellite with a retrograde orbit.

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Uranus is the lightest of the outer planets. it orbits the Sun on its side; its axial tilt is over ninety degrees to the ecliptic. It has a much colder core than the other giant planets and radiates very little heat into space. Uranus has 27 known satellites, the largest ones are Titania, Oberon, Umbriel, Ariel, and Miranda.

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Saturn is the only planet of the Solar System that is less dense than water. The rings of Saturn are made up of small ice and rock particles. Saturn has 82 confirmed satellites composed largely of ice. Titan, the second-largest moon in the Solar System, is larger than Mercury and the only satellite in the Solar System with a substantial atmosphere.

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Jupiter is the largest planet in the solar system. It is composed largely of hydrogen and helium. Jupiter's strong internal heat creates semi-permanent features in its atmosphere, such as cloud bands and the Great Red Spot. Jupiter has 79 known satellites. Ganymede, the largest satellite in the Solar System, is larger than Mercury.

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Mars is smaller than Earth and Venus. It has an atmosphere of mostly carbon dioxide with a surface pressure of 6.1 millibars. Mars has two tiny natural satellites -  Deimos and Phobos. It is also known as due to its red color comes from iron oxide (rust) in its soil.

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Earth is the densest of the inner planets and the only place where life is known to exist. It has one natural satellite, the Moon, and many artificial satellites. Earth was formed over 4.5 billion years ago. Its even called blue plant because when its seen from space its color is blue.

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Venus is close in size to Earth and has a thick silicate mantle around an iron core, a substantial atmosphere, and evidence of internal geological activity. It is much drier than Earth, and its atmosphere is ninety times as dense. Venus has no natural satellites. It is the hottest planet, with surface temperatures over 400 °C, most likely due to the amount of greenhouse gases in the atmosphere.
It is named after the Roman goddess of love and beauty. It is visible to the naked eye in broad daylight. Its sometimes called Earth's sister planet because of their similar size. Its even called "morning star" and "evening star" due to its light.

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Mercury is the smallest planet in the Solar System and the closest to the Sun. Its orbit around the Sun takes 87 Earth days. It is named after the Roman god, Mercurius, god of commerce. Mercury is the closest planet to the Sun. Mercury has no natural satellites.

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The Sun is the Solar System's star and by far its most massive component. It produces temperatures and densities in its core high enough to sustain nuclear fusion of hydrogen into helium. This releases an enormous amount of energy, mostly radiated into space as electromagnetic radiation peaking in visible light.

The Sun is a G 2-type main-sequence star. The Sun's temperature is intermediate between that of the hottest stars and that of the coolest stars. Stars brighter and hotter than the Sun are rare.

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The Solar System is the gravitational bound system of the Sun and the objects that orbit it.  the dwarf planets and small Solar System bodies.

The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud.
The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being more massive than the terrestrials. All eight planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.

The asteroid belt, which lies between the orbits of Mars and Jupiter, mostly contains objects composed of rock and metal. Some objects are large enough to have rounded under their own gravity, such objects are categorized as dwarf planets. The only certain dwarf planet is Pluto.  Each of the outer planets is encircled by planetary rings of dust and other small objects.
The Solar System is located in the Orion Arm, 26,000 light-years from the center of the Milky Way galaxy.