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Venus

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Venus as the evening star

There are three reasons for the brightness of Venus. Two of them - its closeness to Earth, which can be as little as 40 million kilometres and its relatively large diameter (12,104 kilometres), which is only a little less than the diameter of the Earth (about 5 percent) - make Venus a suitable object for astronomical research. But the third reason makes Venus a nightmare for astronomers - the planet is covered by a dense unbroken shell of clouds.

article from ESO
European Organisation
for Astronomical
Research in the
Southern Hemisphere

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