The TCD Logo is adapted by Françoise J. E. Halcomb from an illustration published in 1879 in Camille Flammarion's book "L'Astronomie Populaire". Click on the two curved top panels, left and right of TCD, and on the wheel in the upper-left corner of the main panel in the illustration above for some of the TCD group's research topics, and on the "cosmic traveler" for the group's most curious member.