The SHIP is 5.5 million tons (5.4 from the 21.6 million cu. ft. of metal in the 10-30ft thick cybertronium hull) hence why it only got jarred by the blast. Not taking significant damage is why "no, really, it wasn't a nuke" vagely flies - along with having a timer long enough that the visit to Mars was over and it was in transit to the Earth/Luna system to do the refit with medical gear.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows