The second cosmic velocity refers to the minimum initial speed needed for powerless escape, relying solely on initial kinetic energy. But he could continuously accelerate himself, so naturally, he didn't need to reach 11.2 km/s.
Madara listened with a completely blank look. "What rockets, what second cosmic velocity?"
"You don't need to know all that. You just need to know..." Setsuna explained for him. "...the Earth-Moon distance is 380,000 km. I'll probably maintain ten times the speed of sound throughout, which will take about 31 hours. During this process, you'd better enter suspended animation."
While he couldn't survive in space like Frieza, merely staying alive in space for a few days wasn't a big problem.
"Huh?" Madara was still dazed.
Setsuna took a deep breath, filling every cell in his body with oxygen, then grabbed Madara's arm.
"Wait—"
Before Madara could finish, the two shot skyward like a rocket.
"Too fast!" Madara's facial muscles contorted in the gale-force winds.
While he could also achieve ten times the speed of sound, that was while flying in his Complete Body Susanoo state.
Maintaining constant acceleration with just his physical body, like Setsuna, was simply unimaginable to him.
Setsuna ignored his shout, saying calmly, "We'll enter space soon. There's no oxygen in space. If you don't want to suffocate, quickly enter suspended animation."
Madara gritted his teeth but swiftly formed hand seals, entering suspended animation. His breathing and heartbeat almost ceased.
The flight through space was long and monotonous.
Earth's outline gradually shrank, eventually becoming a sapphire-blue gem.
The universe wasn't beautiful. Darkness and silence swallowed everything.
Fortunately, with Setsuna's strong mental fortitude, 31 hours of monotony was nothing.
Finally, the Moon's surface was within sight.
Unlike the desolate Moon of his previous life, this world's Moon was created by the Sage of Six Paths to seal Kaguya and was also the residence of Otsutsuki Hamura, who monitored Kaguya.
Therefore, the Moon not only had oxygen but even forests and lakes.
Setsuna grabbed Madara's right leg, swinging him wildly in the air a few times to finally wake him.
"Bastard, let go!" Madara was very displeased, 'Couldn't he use a more polite method of waking someone?'
Setsuna complied immediately, releasing him. "Let's go. The Tenseigan is right before us."
Madara's attention was indeed captured. "Now can you tell me what the Tenseigan is?"
Setsuna said, "The ultimate Dojutsu, on par with the Rinnegan. If the Rinnegan is the ultimate form of the Sharingan, then the Tenseigan is the ultimate evolution of the Byakugan."
In the past, Madara would have scoffed, believing the Byakugan far inferior to the noble Sharingan, and the Tenseigan naturally unworthy of being mentioned alongside the Rinnegan.
But after experiencing Obito's absurd awakening, his sense of superiority regarding his Kekkei Genkai had completely vanished.
Madara took a deep breath and asked, "Where is this Tenseigan you speak of?"
Setsuna pointed at the artificial sun in the sky. "Right there."
Setsuna didn't plan to waste time looking for Otsutsuki Toneri. In this time period, Toneri probably hadn't been born yet.
His target was clear: the massive Tenseigan at the center of Hamura's temple.
The space inside the artificial sun was like another world. Countless floating islands hung suspended, lifted by some invisible force.
Hamura's temple sat on one of these spherical islands, exuding an ancient and mysterious aura.
The two entered the artificial sun, opened the temple doors, passed through eerie, vein-like corridors, and finally reached the temple's core area.
A massive golden eyeball over ten meters in diameter floated in the air, radiating a sun-like brilliance.
The Tenseigan's pupil slowly rotated, as if possessing self-awareness, gazing at the intruders.
"This is the Tenseigan." Setsuna raised a hand, gesturing. "Now, go take it."
Madara stared at the enormous eyeball, unusually falling into a daze. "...An eye this big... how can it possibly fit into my eye socket?"
Setsuna couldn't help but laugh. "You're a genius. Can't you think of a way?"
Seeing Madara still pondering, he deliberately added, "If you can't, I'll have to ask the Second Hokage for help."
'Let me go ask that bastard for help? Absolutely not...' The thought flashed through Madara's mind. He decisively refused. "No need. I'll figure it out myself."
First, he activated his Susanoo, attempting to directly merge with the Tenseigan using the giant form of his Complete Body Susanoo.
Naturally, it failed.
Madara wasn't discouraged. He turned to observing the Tenseigan's energy properties.
'This massive Tenseigan contains solar-like fiery Ocular Power. The Rinnegan can use the Moon to perform the Infinite Tsukuyomi. One is Yang, the other is Yin. If I use Yang Release to absorb the Dojutsu power...'
Thinking this, Madara removed his upper garment, looked down at the face of Hashirama on his chest, and suddenly had an idea.
He placed his palm against the surface of the massive Tenseigan. The Chakra of his Otsutsuki body began to resonate with the Tenseigan's Ocular Power.
Golden Ocular Power flowed into the face of Hashirama on his chest like a stream. That originally static face suddenly became animated.
Crack!
With a crisp cracking sound, the skin on Hashirama's forehead split open. A dazzling Tenseigan slowly opened.
Setsuna: "..."
Setsuna couldn't help but scream inwardly, 'Can you eye users please act normal?!'
'Kaguya opening a Rinnegan on her forehead was somewhat understandable. Momoshiki opening eyes on his palms was getting ridiculous. And now Madara opening an eye on his chest?!'
'It's an eyesore!'
Madara, however, was quite satisfied with this result. He gently stroked the Tenseigan on his chest. "Power... is surging out continuously."
Setsuna helplessly rubbed his forehead. "Alright, as long as you're happy. By the way, does your Tenseigan have spatial travel abilities?"
The golden Tenseigan on Madara's chest shimmered slightly. "The Tenseigan is indeed miraculous. Although I've only just grasped it, opening spatial passages feels like instinct."
As he spoke, he waved a hand. The space before him rippled like water. A pitch-black passage slowly formed.
Madara suddenly glanced sideways, a somewhat malicious gleam in his eye. "Aren't you worried? My current strength might have already surpassed yours."
Hearing this, Setsuna became very excited, his eyes blazing. "Want to fight? A fight to the death?"
He was just worried about not having anyone to fight.
Madara: "..."
'What's with this maniacal fighting spirit?!'
Recalling being instantly defeated by Setsuna earlier, Madara's confidence immediately weakened by three parts.
He coughed lightly, forcing a laugh. "Forget it. You're not Hashirama. Fighting to the death isn't necessary."
Madara decisively turned around. The Tenseigan on his chest erupted with dazzling light. The spatial passage instantly expanded.
"Let's go back first. We can't let Otsutsuki Isshiki discover we're not in Konoha."
Setsuna didn't insist either. He took a step forward and found himself back in Konoha the next moment.
Thinking back to the 31-hour journey, Setsuna couldn't help but sigh. "Otsutsuki's abilities are really convenient."