Asked by Mike

why does Venus have such a high Albedo
Answered by E.G.
Because its dense clouds scatter about 80% of the light received..
Answered by drwls
Correct. It is because of the clouds. They are made of low-absorbing liquid droplets -- mostly sulfuric acid. They are a bit more absorbing that earth's water clouds, but still have a high albedo.

Light that enters a dense nonabsorbing cloud is scattered back before most of it can penetrate through the cloud.