What We Knew about Venus?

1. suffers strong gravitational pressure from its own thick atmosphere
2. has the strongest greenhouse gases
3. unstable rotation around the sun
4. too much closer
5. hellish temperature 
6. extremely pressurizied atmosphere that is capable of crushing every rover or other type of landing technology in terms of hours.
7. It's oceans boiled away in the past 500 million years. 
8. Venus lost its magnetic field 1 billion years ago.
9. the seas evaporated into the atmosphere and was trapping heat from the sun which caused the planet to be overheating time and time once again!