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Wednesday, October 26, 2005 - ore 12:33
PLANETS
(categoria: " Vita Quotidiana ")
The rocky planetsThe four planets closest to the Sun are:
Mercury
Venus
Earth
MarsThese are called the ’rocky’ or ’terrestrial’ planets. They are small by planetary standards and made of similar materials to the Earth.
The gas giantsThe next four planets are:
Jupiter
Saturn
Uranus
NeptuneThey are known as the ’gas giants’. They all have rings and lots of moons. The gas giants are made up mostly of hydrogen, helium, frozen water, ammonia, methane, and carbon monoxide.
Planet or comet?Pluto is a tiny rocky body at the edge of the Solar System. Some people think it’s a giant comet rather than a planet. Its composition is similar to a comet (ice and rock). But its orbit is different from the other comets and planets.
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