We find ancient Native American grinding holes, where they processed food some 1,000 years ago.
Related blog: Deep-sky observing at Rancho Hidalgo, by David J. Eicher, editor
Our community is FREE to join. To participate you must either login or register for an account.
Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. View our Privacy Policy.
Astronomy Magazine