Observations and explorations of Venus
The planet Venus was first observed in antiquity, and continued with telescopic observations, and then by visiting spacecraft. Spacecraft have performed multiple flybys, orbits, and landings on the planet, including balloon probes that floated in its atmosphere. Study of the planet is aided by its relatively close proximity to the Earth, but the surface of Venus is obscured by an atmosphere opaque to visible light.
Read on Wikipedia · Image O’Rourke, J.G., Wilson, C.F., Borrelli, M.E. et al., CC BY-SA 4.0
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