What is the problem in observing features on the surface of Venus?
Venus is permanently covered with a cloak of dense clouds of sulfuric acid drops and carbon dioxide. Hence no features on the surface are visible on visual observation. However, such features can be observed by instruments.
Which planet is known as the ‘Red planet’?
Mars. The colour is caused by large deposits of red iron oxide on the surface of the planet.
How hot is it on the surface of Mars?
The temperature on the surface of Mars can vary from 250 C at night.