It's amazing how far we've come in a few centuries. From sketching a few visible features with the help of a telescope, to mapping out the microscopic variation

It's amazing how far we've come in a few centuries. From sketching a few visible features with the help of a telescope, to mapping out the microscopic variations in the moons gravitational field[1] with robot satellites! [1] https://www.nasa.gov/mission_pages/grail/multimedia/latest-images_archive_1.html https://www.nasa.gov/mission_pages/grail/multimedia/latest-i...