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Among the heinous practices prescribed by this cult were mystery rites involving music, intoxicants, orgiastic sex and human sacrifice.

The first ultraviolet observations were carried out in the 1920s, when found that revealed considerable detail that was absent in visible and radiation.

The stratigraphically oldest have consistently lower thermal emissivity than the surrounding basaltic plains measured by and , indicating a different, possibly a more , mineral assemblage.

Such speculations go back to , when and suggested in a article that tiny objects detected in Venus's clouds might be organisms similar to Earth's which are of approximately the same size : While the surface conditions of Venus make the hypothesis of life there implausible, the clouds of Venus are a different story altogether.

It may have had water oceans in the past, but these will have vaporized as the temperature rose under a.

The surface of Venus is effectively ; it retains a constant temperature not only between the two hemispheres but between the equator and the poles.

In the second century, in his astronomical treatise , theorized that both Mercury and Venus are located between the Sun and the Earth.

Related: Venus as the year winds down On Oct.

The similarity in size and density between Venus and Earth suggests they share a similar internal structure: a , , and.