What are the requirements for the different endings in Metroid?

Question

What are the requirements for each different ending in Metroid and what are the differences between each of them?

Answer 1

There are 5 different endings. You can see screenshots of all of them along with requirements here: http://www.vgmuseum.com/end/nes/b/met.htm

• Under 1 hour: Samus removes her suit, revealing a bikini
• 1-3 hours: Samus removes her suit, revealing a one-piece swimsuit
• 3-5 hours: Samus removes only her helmet
• 5-10 hours: Samus waves, but leaves her suit on
• 10+ hours: Samus turns her head away in shame

The Metroid Database lists slightly different requirements for the two worst endings:

• 5+ hours, played with normal Samus: Samus Waves, but leaves her suit on
• 5+ hours, played with suitless-Samus: Samus turns her head away in shame

I'm not sure which is correct.

Answer 2

There's at least one other ending that may be tied in with the "JUSTIN BAILEY _ _ _ _ _ _ _ _ _ _ _ _" code in which Samus has smoke coming from her gun and -don't quote me on this one- the same ending may be available for completing the game with some of the other unusual codes.