Galileo Galilei conducted experiments in the 17th century, studying motion, gravity, and astronomy. He is famous for dropping objects from the Leaning Tower of Pisa to demonstrate that objects of different masses fall at the same rate. He also used a telescope to make observations of the Moon, the planets, and the Milky Way.

Neil Armstrong was an astronaut who was the first person to walk on the moon in 1969. While on the moon, he conducted experiments related to the lunar surface and environment.

Here's a distinction:

* Galileo: His experiments focused on understanding the fundamental laws of physics.

* Neil Armstrong: His experiments on the moon aimed to gather scientific data about the lunar environment.

While both were groundbreaking in their respective fields, their experiments were vastly different in purpose and scope.