Can Move Celstial Objects such as Moons and Small planets, but this taxes him to the limits of his power(Too right it takes the Sun about a hundred years to yield enough energy to duplicate this power).
General Consensus from writers at the moment is that a planetary explosions will cause enough traumatic damage to knock him unconscious. We're talking the same power yield of the detonation of trillions of Nuclear explosions simultaneously. bare in mind that explosions shouldn't really be an effective means of Killing Superman, the heat explosive energies so deadly in usual circumstances will have the same power enhancing effects as solar radiation. Light emitted from an explosion will do the same as light emitted from the Sun. Don't forget the sun is basically a massive self sustaining explosion. I theorize this is why he's usually unable to take the same kind of punishment in blunt force (i.e. fists).
Just below light, unless he enters hyperspace or has some kind of organic warp system built internally.
Yess but most writers (Geoff Johns, Morisson, Mark Waid, Rucka and Duffie) have acknowledged that he is must be doing the previously aforementioned, i.e. biological warp drive or self access into hyper space to achieve this, he probably uses a method similar to the Lanterns when they are going F.T.L.. Its generally accepted D.C. rule that self propulsion beyond F.T.L. by traditional methods (I.e. Non exotic methods mentioned before) will send you into the Speed Force. He can go F.T.L, but he's using a biological exotic means of travel.
i've read waid and johns on the flash, and superman didn't exactly make many appearances. what applies to flash doesnt neccessarily apply to everyon else, too. mcduffie, granted. busiek, i haven't seen, but i'll take your word for it.
About the Doomsday scenario,correct me if I'm wrong but even before he fought DD,Superman was already maxed out power wise as well as stamina and already using his power reserves and by the time he fought DD to the end it was nightfall so he had less time to recharge his body...from reading the novel the death of Superman by Roger Stern but i could wrong about some of the facts so please follow up on this comment..ty
Two important factors about his strength & endurance.
(1) Superman's greatest feats of strength have happened while he's been flying. This leads to the idea that he's using a different power source while performing such a feat. You'd think someone often described as a 'planet mover' would be virtually unmatched - but non-flying bricks like Darkseid (OK he can levitate), Mongul, Doomsday, Orion and Solomon Grundy have all matched - if not exceeded - his strength levels h2h on some occasions.
(2) His powers generate a microscopic layer over his skin that is used for a few purposes. He has great enough durability to tactically use his body as a shield - to help others and try to convince somebody to surrender - but a magic-blessed weapon can cut right through his skin-level aura like there's nothing there. How deep the cut depends on the writer. Wonder Woman's tiara and sword have maimed him; she probably could decapitate him if she was bloodlusted. Only other things that can do the same are connected to green kryptonite & red solar radiation.
"I'm not smart so much as I am not dumb." - Harlan Ellison