How did Peter and Nathan Petrelli survive?

Peter and Nathan surived the big explosion. Here's how it went. If you would remember, Peter was going to explode at the ground when Nathan came to stop Claire from shooting the nearly exploding younger Peterelli. At the next season, it was revealed that when Nathan flew his younger brother to the air to have him explode there with him (which would have made Nathan a martyr), Peter asked to be left alone up there, disentagled himself with his brother, saying that after he explodes, he is gonna regenerate because he already got Claire's power. So, when they parted ways in the space, a few seconds later, Peter exploded and it left Nathan with his skin burned. As Nathan was already in a freefall, Peter suddenly entered the scene to catch his elder brother from falling, and brought him to the hospital. Apparently, he has already regenrated. That's how it went.

****SPOILER ALERT**** Hehehhe...I just finished the Season 2 DVD. So, Peter was whisked away by flying Nathan so the New York blast was prevented. However, Peter was too hot for Nathan to carry and Nathan was beginning to get burned. Nathan dropped Peter, Nathan got so weak, Peter this time rescued him and brought him to the hospital. Peter was kidnapped by The Company, was imprisoned while they took away his powers. There he met Adam Munroe (I won't talk too much now...). Adam can regenerate. He told Peter that if they get out he'd give some of his blood so Nathan will heal. Since Peter got DL's power (walking through walls), they escaped (after much practice). Nathan kept his word. Now you'll all kill me for the spoiler.

From what I've heard Nathat was the one who took up Peter in the air but then he separated from him. He had flown away before Peter exploded. BUt that doesn't mean he didn't got hur (If you have seen the 2 season premiere he had that moment when he was seeing scars on his face + he hasa beard now). And Peter obviously regenerated himself:)

I think that Nathan dropped Peter off in space to explode bc he could heal himself and then Nathan flew back to earth.

Peter convinced Nathan to drop him before he exploded, Nathan was still harmed by radiation burns and was falling to the ground until Peter caught him and took him to a hospital, Later when Peter met Adam they used Adam's blood to heal Nathan

yup...nathan flew away before the explosion

I have no clue but when I saw the last episode of the first Season I knew that both of them had to be alive as well as Sylar. Yeah Peter could have the regeneration power from Claire but Nathan I don't know. Could it be possible that Peter gave Nathan some of the power or Nathan flew away really really fast? I don't know it's really confusing to think about this.