... Venus: Earth's Cloudy Twin . ... If Venus weren't so cloudy it would be more similar to Earth. This picture by the Galileo spacecraft shows just how cloudy Venus is. ... Today the Sun crosses the celestial equator heading south -- marking the Autumnal Equinox, the first day of Autumn. ... Comet Hale-Bopp Fades . ... Brahe, who lived between 1546 and 1601, set out to solve the day's most pressing astronomical problem: to determine whether the Earth or the Sun was at the center of the Solar System. ...