The moon has been altered by human activity. Are we in a 'Lunar Anthropocene?'

Someone in a spacesuit on the surface of the moon stands, facing left, toward an American flag.

When the Soviet Luna 2 probe crash-landed on the lunar surface in 1959, it became the first human-made object to touch the moon. And, according to a trio of academics, Luna 2’s impact also marked the dawn of a new age in the moon’s natural history: an age where humans began to alter the world in unprecedented ways. 

They call it the "Lunar Anthropocene."