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I'm thinking something that happens in outer space.

it can't be a palyndrome

The answer is a year that is the same upside-down and backwards as it is right-side-up. Write them on a paper and try it.

This is one that has probably been heard before, especially if you've read Oedipus. What has four legs in the morning, two legs in the afternoon and three legs in the evening?

Errr... glass?

<----Is incredibly horrible at riddles

Cookie is the winner, your riddle solving skill has gone up five points, congratulations.

What is this?
When it's forward it is heavy, but when it is backwards it is not.
(This ones much easier when it's written out)

Now in this rhyme, you will find all the elements of a riddle,
All the clues are buried here, somewhere in the middle.
My first is in fact the last naturally to be seen,
I am in part a catalyst for refining gasoline.
My second is in party balloons they float up off the ground,
Although Noble I give your voice a tiny squeaking sound.
Equally noble is my third, I'm said to be mostly inert,
I'm used in incandescent lights so the filament won't get hurt.
My fourth is known as devilish stuff, of volcanoes I do smell,
Although no-one's been back to report, I'm supposed to stink like hell!
Finally I am used to make aeroplanes you can trust,
I'm light, I'm strong, I shine like new, I never, ever rust.
Put us all together, and you get what comes before,
Practice makes us perfect, go over it once more.
What am I?

This one racked my brain several times for a long..... time.....
If it has already been answered I apologize for reposting it, and as for the hint I was given, "The answer may or may not contain consonants or vowels."

Please don't put serious thoughts into the hint.

I spent the majority of the time thinking that the hint actually meant something.....

It is the kind of riddle where you think very hard on the answer, but when you finally get it you say, "Wow.... that was so simple... and I made it so hard.... but now I'll never be able to look at myself again because I looked up the answer to make myself feel better."