just like it's raining

Our moon is number 5. It is smaller in direct comparison to the above moons. The diameter of the moon is 3475 km. That is a full 27% of the diameter of the Earth. More than a quarter. That's ridiculous. It's unheard of. The universe is large enough that the word unique probably doesn't mean a lot, but this might be about as close as you get.

This has had a huge impact on our planet. Other things aliens might not have are significant tides. One of Mars's dumpy little potatoes wouldn't be able to move oceans the way our moon does.

Our moon has also stabilized our axis to a massive degree. Without her up there our axis would wobble all over the place and our climate would be far more chaotic. Aliens might not be quite so lucky.

Space is big, empty, and loud. Sunspots can cause enough interference to affect global communications. We’re not even loud enough to talk over our own sun. On our own planet. We can barely communicate with Voyager, and we know exactly where it is and what its signal sounds like.

also apparently this rock art dates across multiple periods spanning thousands of years? but i couldn't find much detail on that so i can't give specifics

but yeah, this isn't just a memory of giraffes, but of giraffes now absent encountered by people just 2000 years (the difference between the late roman republic and today) out of the ice age, in a climate unfamiliar to any of the hundred billion people born since the desertification of the sahara drove the ancient egyptians to the nile, near the start of the agricultural revolution

the time between this and the birth of the sahara was nearly as long as the time between the birth of the sahara and now, in which all recorded history is contained, and all languages we can recognise at all - the language and culture of these people would be totally alien to current libyans, twice the difference between the oldest european language and english, predating all but libya's mountains!

A dream of the fields