The Solar system consists of the Sun and nine planets. These differ in weights, Jupiter is the largest and Pluto is the smallest. The gravity on the planets are also different, the gravity is proportional to the weight. So, Jupiter has the highest gravity and Pluto has the smallest. The planets are rotating on their axes. For example, the day and night of the Earth is the rotation of one revolution.
The satellits and space probes have been become very useful and important when exploring and investigating the planets since measurements and monitoring can be performed without the disturbance of the atmosphere.
The Americans and Russians performed a joint research project with the space ship MIR. For example, the Russian constructed the solar cells for providing electricity. However, also other countries were involved in the MIR project. An other example of international space cooperation is the Swedish site Esrange (situated at latitude 69 degrees), where different European nations do investigations, in particular the Nordic Light.
By Sara Berglund 5A
18/2/08
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