Why is this the answer?

The answer is moon because this is a really fun riddle that talks about something amazing we see in the sky almost every single night. Let's look closely at the clever clues in this little poem! The riddle starts by calling the object "My love" and talks about gazing on its "beautiful face." When the sky is dark, the moon is a beautiful, round, silver face that shines down on us, and people have always loved to look at its glow. The next line says it is "Careering along, yet always in place." To 'career along' means to move quickly, and the moon is always traveling quickly in a big circle around our Earth. However, when we look up at it, it also seems like it stays in the same spot for a long time each night as it follows us across the sky, making it feel like it is "always in place." Even though it is moving, it seems very steady. Now for the best and most important clue: "If I ever shall see thy glorious behind." This is the special secret that unlocks the riddle. The moon is the perfect answer because we can only ever see one side of it from Earth! Even though the moon spins around, it travels around our planet at exactly the right speed so that its other side, its "glorious behind," is always facing away from Earth. This amazing fact is why the moon fits every part of the riddle. Because of the way gravity works between the Earth and the moon, they are "tidally locked." This means the side we see is the near side, and the side we don't see is the far side. You could look at the moon a million times in your life, and you would always see the same "face" staring back at you. This wonderful, old poem is a very clever way to describe our amazing neighbor in the night sky and the wonderful secret it keeps hidden from us.