What's changing the face of Venus? Magellan's early images say it's nothing like plate tectonics. (Magellan spacecraft)

Science News | May 4, 1991| | Copyright

Planetary scientists often refer to cloud-covered Venus as Earth's mysterious twin, citing the two planets' similarity in size, density and distance from the sun. But the Magellan spacecraft's radar has now given scientists their sharpest look beneath Venus' thick atmospheric veil, and the emerging portrait suggests that while the twins resemble each other, they are certainly not identical.

Even more important is what these superficial differences reveal about the geologic processes molding the surface of each planet. Before the Magellan project, some researchers ...

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