6th Moon 30, 1004 PLR
To the humans of the Earth, third planet from the star Sol,
Your "spacecraft", Voyager, was discovered by the beings of this planet approximately eight moons ago, but I find myself only now able to pen an adequate reply. While we as a people are mighty in the ways of magic, the ponies and other creatures that make up the nation of Equestria have fallen behind in the ways of technologies, which are more prominent in peoples like the Minotaur, though not nearly to the level of your displayed "human" inventions. As such, it has taken many moons to calculate the approximate location Voyager traveled from, to map your star system of origin using the depiction you provided, and to compose a reply in the form of a record of our own. At the time of my composing this, a suitable return ship has not yet been complete, though several prototypes are now in the testing phases.
My sister and I are the rulers of the land of Equestria, a great nation of perhaps five million creatures, the vast majority being races of ponies. While we control the sun and moon with our respective magics, most, including ourselves, never truly considered the idea of other life elsewhere in the cosmos. Ponies are more simple than that, content with the world around them, and we are often preoccupied with settling the problems of our own citizens. However, your message has been well received not only by us, but the populace as a whole.
Equestria relies on friendship as a form of magic, and I mean this in the most literal sense of the word. My protegé, the pony who found your fallen ship, detected no ambient mana on the record it contained, and this was confirmed by the Canterlot Mage Council. As such, we hope our words, messages, and offers of friendship in return are understandable to you, as they rely heavily on magics to transmit instead of your advanced technologies. As you appear to be more advanced in this manner than us, we are confident in your abilities to do so.
If such is possible, I wish to tell you this:
I offer my hoof as leader of Equestria to the humans of planet Earth in the name of friendship and harmony. While we have determined the age of your craft is in excess of a million years old, longer than ponies and myself have existed, it is our sincere hope that your species has thrived in the time since it was sent. We also understand it may be possible that your people have lost documentation of Voyager in the first place, so a copy of your original record will be returned with ours. The date on it is listed as "July 29, 1977", and is from a "Jimmy Carter". While the sender has long since passed on if our guesses as to human lifespans are correct, I would like the populace of your planet to be aware that it was his letter than has sparked me to write this in return, though I am fully aware that he will not be able to read it. I only hope that, if your peoples also believe in an afterlife, he can take solace in that his words were well received, and his message of good will greatly reciprocated.
It is my sincere wish that we will be able to open contact with one another — to teach, to learn, and to befriend. If humans receive this message and are able to understand it, please send a reply as you are able. We will include a star map on our record, as you did with yours, to assist in finding our approximate position. Let us meet together in friendship and harmony, and may the wings of destiny carry you aloft to dance with the stars.
Your friend,
H.R.H. Princess Celestia, Canterlot, Nation of Equestria, Planet Equis