Venus probably has a mild, wet, Earth-like surface hidden beneath its clouds.

Venus resembles Earth in size and mass, but its global cloud cover hid the surface from ordinary telescopes. That combination left room for a wide range of pre-space-age models.

Some scientists and popular writers imagined a humid, oceanic, or even swamp-like world beneath the clouds. Others already suspected much hotter conditions, so there was never one uniform “Venus jungle” consensus.

Radio observations increasingly pointed toward extreme temperatures.

Mariner 2’s 1962 flyby confirmed that Venus was extraordinarily hot, and later Soviet Venera landers directly measured a surface with crushing pressure and temperatures around 465°C.

The dense carbon-dioxide atmosphere produces a powerful greenhouse effect, while the surface is dry and hostile by terrestrial standards.

Venus remains Earth’s closest planetary analogue in size and bulk composition, which is exactly what makes the contrast scientifically important.

The overturned claim is the broader expectation that the cloud-hidden surface could be mild and broadly Earth-like—not that every astronomer specifically predicted oceans or vegetation.