... Beneath Venus' Clouds . ... If the thick clouds covering Venus were removed, how would the surface appear? ... Venus: Earth's Cloudy Twin . ... Today the Sun crosses the celestial equator heading south -- marking the Autumnal Equinox, the first day of Autumn. ... Comet Hale-Bopp Fades . ... The Sun Erupts . ... 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. ...