When Earth and Venus are at their closest points, they are only 23.7 million miles apart. Nonetheless, our sister planet remains a mystery. Several spacecrafts have been sent to the surface, but the planet’s extreme temperatures and high pressure inevitably disable and crush the crafts soon after landing.
Until then, Venus will continue to fascinate, as this image of the transit of Venus across the sun's path amplifies. This event happens in pairs eight years apart that are separated from each other by 105 or 121 years. The one shown here was in 2012. The previous transit was in 2004 and the next will not happen until 2117.