Asanteni wote.
Shule nilikosoma walituambia Oceania ni continent na nikaamini hivo. leo nagundua it is just a school of thought. walisema pia solar system ina sayari 9, school of thought... thank you all, nimeelimika
The Planets
Mercury
Mercury is the smallest and closest planet to the Sun. Mercury has no moons and has no special features other than impact craters and lobed ridges. Mercurys thin atmosphere consists of particles blasted off by the solar wind from the Sun. It has a large iron core and a thin mantle layer, possibly due to constant impacts which prevent its layers from developing over time.
Venus
The second planet is slightly smaller than Earth. It has a dense atmosphere and an iron core. It is the hottest planet with blistering surface temperatures (over 400 degrees Celsius). Venus atmosphere is very toxic due to clouds of sulfuric acid. The planet may have had water at one point of time, but these have evaporated over time due to the extreme heat. Volcanic activity have been observed on Venus surfaces, though there have been no signs of lava flow.
Earth
Earth is the largest of the inner planets. It is one of the few, if not only, places in the universe where life exists. It has one moon, the Moon. Earth core is very active, and it is the only planet with tectonic plates. Earths biosphere has long since altered its atmosphere, creating more oxygen as well as an ozone layer to block harmful radiation from its surfaces.
Mars
This is the second largest planet and the fourth from the Sun. Mars has a carbon dioxide atmosphere. It has two moons: Deimos and Phobos. These are said to be captured asteroids. Its reddish color is due to the large amounts of iron-oxide on its surface. Its atmosphere is very thin and its surface is ridden with impact craters, like that of the Moons.
Jupiter
Jupiter is the size of 318 Earth masses. It is the largest planet in the Solar System with 2.5 the mass of all the other planets combined. It is composed of mostly hydrogen and helium. Jupiter has 63 known satellites. Jupiter has a rapid rotation which has caused it bulge slightly around its equator. The atmosphere of Jupiter creates lots of storms on its surface, the prominent result of which is the Great Red Spot, which is actually a continuous storm which has endured since the 17th century (when it was first observed by telescope).
Saturn
This planet is just beyond Jupiter and is known for its large ring, which actually consists of 9 bands of rings. Saturn is about 60% the volume of Jupiter and has the lowest density of all the planets. It has 62 satellites, including Titan and Enceladus. Saturns core consists of iron, nickel, silicon, and oxygen compounds, all surrounded by a thick layer of metallic hydrogen. The planetary magnetic field on Saturn has contributed to an electric current through the metallic hydrogen layer.
Uranus
Uranus is unique in that it orbits the sun on its side because of its axial tilt. Uranus has 27 known moons, including Titania, Oberon, Umbriel, Ariel, and Miranda. While Uranus is similar to Jupiter and Saturn in that its atmosphere contains hydrogen and helium, it also contains copious amounts of iced water, ammonia, and methane. Furthermore, it has the coldest atmosphere in the Solar System at -224 deg C. Uranus and Neptune are also termed ice giants.
Neptune
Neptune is smaller than Uranus but is denser. Neptune has 13 known satellites, including Triton. Neptunes surface gravity is only surpassed by Jupiter, and the two are the only planets with surface gravities greater than Earths. Neptune contains iced compounds like those of Saturns as well as greater concentrations of volatile elements found on Jupiter and Saturn.
Pluto
Pluto used to be considered a planet in the sense that the Mercury or Jupiter is. However, it is now considered a dwarf planet because it lacks characteristics that define the planets in the Solar System.
Source: planet-facts