Today, NASA payed tribute to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA colleagues, during the agency's annual Day of Remembrance, Jan. 28. In honor, a photograph of the Space Shuttle Challenger, atop a mobile launch platform, slowly moves through the Florida fog to Launch Pad 39A in preparation for its first liftoff on the STS-6 mission. The fully assembled Shuttle, weighting 12,000 pounds less than predecessor Columbia, completed the trip to the pad in just over six hours on Nov. 30, 1982. Credit: NASA #challenger #NASA #dayofremembrance