Six planets will line up in the early morning sky on June 3, but most won’t be visible to the naked eye. A planetary parade happens relatively often when several planets align on the right side of the sun, making them visible across a narrow band of our sky. During the latest parade, astronomers say only Mars and Saturn will be visible to the naked eye. The other planets can only be spotted with a telescope or will be blocked out below the horizon. You can still catch a glimpse of Mars and Saturn through the end of summer.