Planets Ahoy!
Can you spot the Solar System's four rocky planets ? In the above image taken on September 20, all of them were visible in a single glance, but some of them may be different than you think. Pictured above , the brightest and highest object in the sky is the planet Venus . The object lowest in the sky is the planet Mars , while the object furthest to the left is the planet Mercury . The last remaining point of light is . . . the bright star Spica , which leaves the question -- where is the fourth rocky planet? That would be Earth , specifically part of Australia , visible across the entire bottom of the image.