THIS DAY IN SPACE

Launch of NASA's CONTOUR Probe Fails
On October 7, 2002, NASA lost contact with the Comet Nucleus Tour (CONTOUR) spacecraft—a mission designed to study the nucleus of comets by performing flybys of multiple targets. Launched in July 2002, CONTOUR was supposed to ignite its solid rocket motor on this day to leave Earth orbit and head toward Comet Encke. However, following the planned motor burn, all signals from the spacecraft ceased. Despite numerous attempts to reestablish communication, NASA declared the mission a failure. Later analysis suggested that the spacecraft might have broken apart due to structural failure caused by the rocket motor ignition. The loss of CONTOUR was a significant setback in cometary science, as it was intended to capture high-resolution images and conduct in-depth spectroscopic analysis of cometary material. Although disappointing, the mission’s failure led to more rigorous planning and design strategies for future missions. It also highlighted the complexity and risks inherent in deep-space missions that involve trajectory changes and high-energy burns. Despite its brief life, CONTOUR’s demise played a role in shaping NASA’s approach to future exploratory missions, like the more successful Deep Impact and Rosetta projects.

Discovery of the 'Martian Canals' Detailed
On October 7, 1888, Italian astronomer Giovanni Schiaparelli published further details on his observations of 'canali' on the surface of Mars—long, dark lines he believed were natural channels. Though the term 'canali' translates to 'channels' in English, it was mistranslated as 'canals,' implying artificial structures. This sparked widespread speculation about intelligent life on Mars. Schiaparelli's October 7 report built on his previous 1877 observations but added more detail, mapping a complex network of intersecting lines across the Martian surface. These observations inspired a wave of popular imagination, with figures like Percival Lowell publishing theories about a dying Martian civilization building canals to transport water from the polar caps. Although modern telescopes and spacecraft have since debunked the canal theory—attributing the illusion to optical artifacts and observer error—the October 7 publication stands as a pivotal moment in planetary science. It fueled public interest in Mars exploration, influenced early science fiction, and demonstrated the power of observational astronomy. Schiaparelli’s maps and writings were among the first systematic attempts to chart another planet’s surface, laying groundwork for later, more accurate imaging by spacecraft such as Mariner 4 and the Mars Reconnaissance Orbiter.