An unexpected guest greeted the Artemis II crew upon their return to Earth, and the footage has quickly gone viral.

The cartoon alien is a remarkably durable idea: a small, vaguely human figure, usually with a big head, large eyes and green skin. That image grew out of early science fiction and mid‑20th‑century UFO ...

It's bright green, about 13 feet tall and sticks its tongue out at everybody who looks at it. Its name is "Goop," and the sculpture used to live at Magic Carpet Golf, until he was adopted in 2009 ...