Venus has a high surface air pressure. According to NASA, the pressure is about 100 times that we feel on Earth. If you were able to send a polystyrene cup to Venus, it would shrink to 1/3 of its volume. This is due to the pressure acting upon it. To get a similar result on earth, you need to submerge the cup to 900m below sea level.

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Source: https://solarsystem.nasa.gov/planets/venus/overview/