Incorrect PIN <a href=" http://www.blogdojorgearagao.com.br/tag/guimaraes/ ">viagra calis cialis</a> The Apollo astronauts who explored the moon found its surface covered with a fine dust made from crushed lunar rocks. This powdery dust is the result of billions of years of meteor impacts that also created the moon&#x2019;s cratered surface we see today. Scientists believe electric charges build up at the boundary where the &#x201c;daytime&#x201d; (or light) and &#x201c;nighttime&#x201d; (or dark) sides of the moon meet. These charges could possibly lift dust from the surface high into the moon&#x2019;s atmosphere.