Figure 10-13 RIVUXG A Binary Star System As seen from Earth, the two stars that make up the binary system called 2MASSW J0746425 + 2000321 are separated by less than arcsec. The images surrounding the center diagram show the relative positions of the two stars over a four-year period. These images were made by the Hubble Space Telescope (HST), the European Southern Observatory’s Very Large Telescope (VLT), and Keck I and Gemini North in Hawaii (see Figure 2-28). For simplicity, the diagram shows one star as remaining stationary; in reality, both stars move around their common center of mass.