Composite image of AB Aurigae. The large scale image is from Grady et al. (1999), taken with the Uni Hawaii 2.2 m Telescope at λ = 0.647 μm by P. Kalas. The medium scale inset is from the same paper, taken with the STIS instrument on the Hubble Space Telescope at λ = 0.57 μm. Both images were rotated with respect to their published form to put north up. The smallest inset is from Fukagawa et al. (2004), taking with the CIAO instrument on the Subaru telescope in the H band (λ ≃ 1.6 μm). The scale bar is 20′′ which for d = 153 pc (Gaia DR1 data release: Gaia Collaboration 2016) amounts to 3060 AU. The image shows the disk in the center out to at least 430 AU and a fainter much larger arc-shaped envelope with nearest approach to the star on the sky of about 1300 AU, but extending out to at least 6000 AU. All images used with permission of the authors of the referenced papers.