It's a debate amoung many scholars if humans ever got a chance to explore their moon.
Since it's been hundreds since any sovereign humans state has existed, and almost all humans were expelled from the sol system only a few generations after the conquest of earth, outside scholars didn't have as much of a chance to see humans in their native environment as they wanted to. So for those who are studying the sol system after its resettled (useally referred to as auxus by the new settlers) they have mostly archeology to go on.
Now, some have tried to consult the humans for their own cultural memories of such things. And though the human diaspora is very large, serving the role of "middle man minority" in a lot of planets, and taking especially well to spaceships, that doesn't mean anthropology should trust their history as they tell them. Because of how primitive humans were at the time of the conquest, their history as they wrote it is thought of as more of a mythology then a history, important for analyzing the character of humanity, but not an objective account. And unless archeological research backs something up, human primary sources are assumed to be myth.
Now. There is archeological proof that someone was building spacecraft in the sol/auxus system around the time of conquest. We've seen examples of the human homeworld Nexcur (called earth in the human's language) having strange and unknowable machines orbiting it as artificial satellites. And Nexcur's moon has objects such as a flag planted on it, and the closest planet to it has some small unmanned vehicles. It's unknown who made these and why, and has been a mystery since its discovered. Some people think the nearby gaetgians or trinurians built them, others think that the iiriu built them long before the humans evolved. There's even some theories that the yethyy empire built them in preparation for the conquest of earth. There's even more crackpot theories about divine beings or ancient interdimensional entities making them on some corners of the internet.
Of course. The humans almost all claim their ansestors made them, pointing to their own myths. Scholars are just starting to take it seriously, though many remain rather skeptical. The humans were known to be a primitive and warlike species on their homeworld, with no ftl capabilities, the idea of them sending anything to space is laughable to a lot of academics. And it very much differs from the image of humanity that most people have when the think about that time period. Humans have a reputation for taking their mythology a bit too seriously, such as claiming heritage from mythical kingdoms such a King Arthur's Britain, the Odyssey's Greece, or Journey to the West's China.
There is also the obvious problem with any archeological research around what is now auxus which is its religious significance to cultures such as the yethyy and aeretiel. While we try not to offend their religious ideas, and treat them with respect, it is often a problem when their religious ideals of an ancient significance in auxus clashes with the archeological reality that before 1458 SD there is no evidence of non human civilization. For example the mummified body that many yethyy claim to be their prophet kkayykar (despite not even possessing the right amount of eyes or arms to be a yethyy) was recently identified as the mummy of the human king Lenin. However, it's still in a yethyy temple, and still in the power armor the yethyy added to it (partially to make him look more like their own race), as archeologists don't want to offend yethyy heritage.
Still, as no religion has fully claimed the ancient evidence for human era space travel as their own, now is the perfect time for archeologists to learn more about them. More and more of human mythology is being proven plausible, especially as the human mythological creatures known as "dinosaurs" have finally been proven to have some basis in paleontological reality in recently. Science still waits to find out more about auxus's fascinating history and prehistory.