英文
英文
Draw a diagram showing the Sun and the orbits of Venus,Earth and Mars.
a.Use your model to explain why Venus is visible only in the morning or evening sky,but Mars can also be seen at midnight.
b.Venus goes through phases,like the moon.On your diagram,show where Venus would be when is was'full'
Draw a diagram showing the Sun and the orbits of Venus,Earth and Mars.
a.Use your model to explain why Venus is visible only in the morning or evening sky,but Mars can also be seen at midnight.
b.Venus goes through phases,like the moon.On your diagram,show where Venus would be when is was'full'
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