A.No man-made structures are visible from outer space. From the Earth's low orbit (135 miles), highways, dams, cities and China's Great Wall are visible.
Q.Wot is the brightest star andy
A.Sirius is the brightest star in the sky, twice as bright as the next brightest, Canopus, & 25 times brighter than the Sun. It's 2 stars - Sirius A & B.
Q.What is the biggest looking star or planet in the sky
A.Venus is the biggest looking star or planet in the night sky. Apart from the moon, it is the brightest visible object after dark.