He recorded some of the first telescopic observations of Venus, considered outstanding in terms of their care and accuracy.
Astronomers refer to Venus as Earth's sister planet.
Both are similar in size, mass, density and volume. Both formed about the same time and condensed out of the same nebula. However, during the last few years scientists have found that the kinship ends here. Venus is very different from the Earth. It has no oceans and is surrounded by a heavy atmosphere composed mainly of carbon dioxide with virtually no water vapor.