Riddle me this:
Curved material inside,
Reveal what is too far away.
Only when turned to the sky,
Stars are brighter in grey.
Seven years overdue,
Before lifting off the ground.
Orbiting, it flew;
New spiral arms were found.
Eyesight surrendered to me,
Since the seventeenth century.
What could I be?
I feel this might be too easy for some, so I will not provide a hint.
Well, I might just add one little thing to make it fun. This is an extra puzzle to find the replacement word. It is not included in the riddle, but can be of help :)
When typing out this riddle, I made a typo in a word and it autocorrected to "material". Now, I don't remember what that word was, but when reflecting back on writing it, I thought of one letter: $\verb|m|$. But am I right?
This is just a thought, but maybe the word contains the letter $\verb|m|$? I can't be sure...
Or actually, I think the word may have started with that letter, and I think it might have had an $\verb|r|$ possibly, but I know that the rationale behind the answer has not changed. Obviously, if the current answer did not remain the same without this word, I would know — I wrote this riddle!
It is just that the word "material" seems a bit vague. If only I knew what the original word was...
There is a pattern. The following clue should give you a bit of a start.
In the very first sentences, how many words are there before one contains $\verb|m|$?
The "replacement word" is hidden in this little hint. If you can't find the pattern, you can still use the hint to your advantage, but there would just be a lot of fluff to read through.