Buzz Aldrin propellants, with an expected five and a half month journey from the Earth to Mars, and a return trip to Earth of about the same duration on a twin-cycler. Aldrin continues to research this concept with engineers from Purdue University. In December 2003, Aldrin published an opinion piece in "The New York Times" criticizing NASA's objectives. In it, he voiced concern about NASA's development of a spacecraft "limited to transporting four astronauts at a time with little or no cargo carrying capability" and declared the goal of sending astronauts back to the Moon was "more like reaching for past glory
Celebrate the Century September 1999. Denomination: 33¢ No of stamps in sheet: 15 The stamps: Background image: Astronaut Buzz Aldrin sets up seismic equipment to record lunar tremors. Intaglio stamp: Buzz Aldrin's . Title: "Bicentennial, Watergate, and Earth Day". Date of issue: 18 November 1999. Denomination: 33¢ No of stamps in sheet: 15 The stamps: Background image: Ships gather in New York Harbor under the Statue of Liberty to take part in Bicentennial celebrations, July 4, 1976, marked the 200th birthday of the United States. Intaglio stamp: Videocassette recorder. On the occasion of the unveiling of the Boeing 747 stamp by the USPS,