来自付继光的问题
英文DrawadiagramshowingtheSunandtheorbitsofVenus,EarthandMars.a.UseyourmodeltoexplainwhyVenusisvisibleonlyinthemorningoreveningsky,butMarscanalsobeseenatmidnight.b.Venusgoesthroughphases,likethemoon.Onyourd
英文
DrawadiagramshowingtheSunandtheorbitsofVenus,EarthandMars.
a.UseyourmodeltoexplainwhyVenusisvisibleonlyinthemorningoreveningsky,butMarscanalsobeseenatmidnight.
b.Venusgoesthroughphases,likethemoon.Onyourdiagram,showwhereVenuswouldbewheniswas'full'
