Giant Canyon on Mars Is Still Tectonically Active Today

Commenters were impressed that researchers inferred a strike-slip event 20-40 km underground from a single Martian seismometer, seeing it as a striking demonstration of what limited seismic data can reveal. The canyon’s enormous scale prompted reflections on perspective: one commenter said a person on its walls might not recognize it as a canyon, while another countered that much of its length has slopes around 35%, steeper than the 10-15% estimate. The discussion also turned to Hellas Planitia, which one commenter speculated might be related to the volcanic region on the opposite side of Mars and wondered why it had not been a higher-priority rover destination.

Several commenters focused on the possibility of life. They described deep underground environments as promising places to search, and one noted that Hellas may approach conditions where liquid water is possible, while raising planetary-protection concerns. Another suggested that transient pressures in araneiform terrain could help life spread. Others wondered how long favorable conditions would need to last for biology to exploit them. On human exploration, one commenter argued that an astronaut with a shovel could accomplish far more than rovers, but others emphasized hazards such as fine dust, radiation, and the difficulty of supplying necessities. They favored the Moon as a more practical base for research, orbital infrastructure, and deeper missions.