In this paper, I look at two outerspace-related events in Mexico as a way of asking questions about the temporality of coloniality on and off the earth. The first is the 1969 Moon landing, whose reception in Mexico speaks to the country's ambivalent relationship with the United States and hegemonic models of technoscientific progress. Mainstream news outlets almost uniformly celebrated Neil Armstrong's moonwalk. However, coverage printed in La Cultura en México, the weekly cultural supplement of Siempre magazine tells a more nuanced tale, as the week's headline is divided into two: on the bottom, "Armstrong walks on the Moon," and on the top, "A history of Trotsky in Mexico." Inside the supplement, photographs of the NASA astronauts on the moon are accompanied by a more critical collection of texts titled "8 Poets React to the Moon Landings". The second is a ludic workshop that imagines a "Mexican city of memory on Mars" resulting from a month-long engagement with the neighborhood of Tlatelolco in Mexico City. In their speculative creations, participants engage with Tlatelolco's heterochrony, as the place where the indigenous population that fought against Cortés was massacred in 1521, the site of the 1967 signing of a major international anti-nuclear treaty, and the location of an infamous government massacre of students in 1968. Martelolco takes the weight of memory and history to the red planet, questioning the neocolonial dream of a fresh start on another world. These narrations place temporality at the center of the extraterrestrial colonial entreprise, unveiling some ways in which historical memory may contest hegemonic futures and underlining the importance of ethnographies of outer space in out-of-the-way places.