What are those strange white patterns in China's Gobi Desert? For weeks, experts have puzzled over the crazy lines that show up in satellite images.
Some of the theories have taken wild turns: Maybe they're messages directed at Earth-observing extraterrestrials, or part of a UFO development program, or the remains of ancient cities. But the leading theory is that these patterns serve a variety of purposes for the Chinese military, including calibrating satellite imaging systems and testing radar avoidance techniques. There have also been claims that these are "fractal antennas" to shield underground weapons facilities from ground-penetrating radar.
This particular crazy-quilt pattern was picked up on July 27 from an altitude of 423 miles by the Ikonos satellite, one of the spacecraft in a commercial Earth-imaging constellation operated by GeoEye. The picture is today's offering from the Cosmic Log Space Advent Calendar, which features views of Earth from space every day until Christmas.
Whatever the precise purpose of these patterns might be, it's not all that unusual for people to draw huge lines in the sand: Consider Peru's famous Nazca Lines, which were etched more than 1,500 years ago to form patterns that look like geometric shapes, insects and birds. Some of those patterns can be seen in their full form only from the air. More recently, archaeologists have puzzled over wheel-like patterns in the Middle East.
What do you think about the Gobi puzzles? Feel free to add your comments below, and check out these past entries from the Advent calendar:
- The full Cosmic Log Space Advent Calendar
- Dec. 1: An ornament in outer space
- Dec. 2: The masses in Mecca
- Dec. 3: Santa's shrinking domain
- Dec. 4: The monster of Madagascar
- Dec. 5: Antarctica stripped naked
- Dec. 6: Streaking for home
- Dec. 7: Pearl Harbor from above, 1941-2011
- Dec. 8: The rise and fall of the Dead Sea
- Dec. 9: How an eclipse dims Earth
- Dec. 10: Psychedelic storm
- Dec. 11: Beauty of the Inland Sea
- Dec. 12: Drone-spotting stirs up debate
- Dec. 13: Light up your St. Lucy's Day
- Dec. 14: Satellite spots Chinese aircraft carrier
- Dec. 15: Hooray for Hollywood
- Dec. 16: Olympics under construction
- Hubble calendar, from The Atlantic's In Focus
- 2011 Zooniverse Advent calendar
Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.