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Mars is one of the eight major planets of the solar system. It is the fourth planet in our solar system from inside to outside. It belongs to the terrestrial planet(类地行星). It has a diameter of about half of the earth. The period of its revolving on its axis, is similar to the earth, while the period of its orbiting around the sun is two times of the earth . The Orange red appearance is caused by iron oxide(氧化铁)on its surface. Mars is basically a desert planet with dunes(沙丘), gravels(砂砾) everywhere. There is no liquid water on Mars. With thin carbon dioxide and dust in the atmosphere it is cold and try all year round. In winter the cold temperature can reach minus 130 degrees centigrade while in summer time it can rise to 27 degrees Celsius. Strong sand storms visit this planet every year. The Martian poles have dry ice caps with seasonal fluctuation. Mars has two moons rotating around it. Mars can be seen by the human eyes and it is slightly darker than the Venus(金星) but much brighter than Jupiter(木星). The nearest distance from Mars to the earth is about 55 millions kilometers, while the farthest distance is about 400 million kilometers.
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Interplanetary robot Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of 'Martians' is a vision of life beyond Earth. The Mars adventure continues with the launch of a robot vehicle by UK scientists. It's part of project to build an 'autonomous robotic scientist' to explore the Martian surface and is key to the European Space Agency's 2011 ExoMars mission.The six-wheeled vehicle housing a myriad of scientific instruments and detectors is the Mars rover, nicknamed 'Bridget'. Astrium, an EADS company, are developing the ExoMars rover prototype and coordinating its technologies with other UK-based institutions.Test bed to prove the rover's stamina Searching for a terrain similar to that found on Mars, the team took the rover to El Teide National Park in Tenerife. Lester Waugh, leading the EADS Astrium team, explains, 'The rover's not waterproof so we need good weather to test it in, but also the conditions need to be dry as any moisture affects the way the sand reacts under the wheels.'Solar panels will supply power and radioisotope heater units will help it withstand the extreme cold on Mars. The team is optimizing the performance of the wheels, suspension, the drive system, so it doesn't dig itself in on tricky terrain.Taking up to twenty minutes for radio signals to reach Earth demands a powerful navigation system to allow the rover to operate solo so they are also developing next generation computer software capabilities.Maximizing productive science time The rover will land on Mars packed to capacity with scientific gadgets designed to be as light and as small as possible. These include: a microseismometer searching for Marsquakes; an advanced meteorological system analysing the Martian weather; a wide-angled panoramic camera which will be our eyes on Mars; a Raman spectrometer providing rock analyses; even a mole to retrieve samples from beneath the surface.The extended development time is essential for rigorous testing, as Waugh explains, 'When we put things in space we have to make sure that they'll survive the radiation environment, the extremes of heat and cold. Our science productivity is crucial, and malfunctions may affect that. The more science we get back the better justification there is for spending more money on planetary exploration.'
你可以多看看，好句子可以记下来，但是，在考试的时候不建议直接用上面的模板。因为这本书会有很多学生购买来用啊，雷同的作文换做你是阅卷老师，也不会给多少分数的。建议
帅帅老牛 评论（4） 2026-02-20 Mars is one of the eight major planets of the solar system. It is the fourth pla
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小猪行天下1212 评论（3） 2026-02-20