What Effects Has Humanity Had on Outer Space?

We’ve left clues and evidence of our existence to intelligent life forms — what are they?

The NGC 2775 galaxy captured by NASA’s Hubble Space Telescope, located approx. 67 million light years away. Photo courtesy of NASA.

I geek out about space: astronomy, astrophysics, and space travel. Men in Black fan, student, and lifelong learner.