Students use contrived star field photographs to find a planetary object.
The student will determine the distance to the object using trigonometric parallax. Clyde Tombough discovered Pluto in the winter of 1930. He made this discovery by comparing two photographs of the stars taken several months apart. This strategy also demonstrated that meteors are phenomena that occur in the atmosphere and that comets are much more distant than the Moon. Align stars in Star field Two over Star field One. 4.