EIJING, Dec. 7 (Xinhua) — The cube-like object spotted recently by China’s lunar rover on the far side of the moon aroused wild curiosity in cyberspace worldwide this week.

Yutu-2, the lander, and rover of the Chang’e-4 probe captured an obscure but intriguing image about 80 meters from its location during the mission’s 36th lunar day, according to Our Space, a Chinese science channel that published the machine’s latest diary on Dec. 3.

Something cubic loomed on the horizon to the north, sitting next to a young impact crater, said the rover’s log. The image sparked heated debates on social media platforms.

Some described it as the remains of one of the smaller rocks that has collided with the moon. This was echoed by space journalist Andrew Jones, who considered it as a large boulder.

There is no shortage of sensational explanations, however. “There seems to be a lot of straight lines in this feature, that’s very uncommon in nature, which is normally fractal-based,” tweeted “Viu Mobile,” an astronomical amateur from Texas, on Monday.

It might be “some structure from an ancient civilization on the Moon,” tweeted David Michaels.

More people tend to make fun of it. It has been imagined as Arc de Triomphe in Paris, the Marble Arch in London, the barbette of naval guns, and a handle of the moon like that of a kettle-bell.

A Chinese online user at weibo.com compared it to the Guanghan Palace, where the goddess of the moon lives in ancient Chinese mythology.

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