Venus is the second planet from the Sun and it is also the closest planet to Earth. Venus and Earth are both rocky planets and they are almost the same size. But Venus is extremely hot because a thick layer of swirling acid clouds covers it completely.
This combination of heat and acid clouds makes it impossible for astronauts to land on planet Venus.
Even though the first space probes that visited Venus were made of tough material, they were crushed as they tried to land. Later probes lasted just long enough to send a few pictures back to Earth. Why? The air on this planet presses down much harder than the air on Earth.
