Bussani wrote:You won't lose body heat very quickly in a vacuum because there needs to be air for conduction/convection to take place. The lack of pressure shouldn't cause too much harm; even in humans it would mostly only cause some temporary swelling. The radiation and severe risk of sunburn are more concerning, but it really is the lack of air that gets you.
Goku and co. don't instant travel through the layers of Earth instantly, not even Cell during filler space traveling scenes. Goku would lose a lot of body heat as he progress to through the layers due to sudden drop or rise in temperatures. Here's a real life quote that talks about the effects of outer space on Human "Vacuums are indeed lethal, under extremely low pressure air trapped in the lungs expands, tearing the tender gas-exchange tissues. Water in the soft tissues of your body vaporizes, causing gross swelling, though the tight seal of your skin would prevent you from actually bursting apart. Your eyes, likewise, would refrain from exploding, but continued escape of gas and water vapor leads to rapid cooling of the mouth and airways.
Water and dissolved gas in the blood forms bubbles in the major veins, which travel throughout the circulatory system and block blood flow. After about one minute circulation effectively stops. The lack of oxygen to the brain renders you unconscious in less than 15 seconds, eventually killing you. "When the pressure gets very low there is just not enough oxygen. That is really the first and most important concern," Buckey says. That's assuming if you were immediately dumped into outer space.
I hope you realize those filler scenes don't make any sense when hey contradict each other, there are two different scenes showing Vegeta nearly drowning for a lack of air, the first being hiding underwater after stealing Freeza's dragon balls, the second time after Zarbon thrashed him duking him into water and filler goes out its way to show Goku incapable of handling space with a few key scenes. The first that comes to mind is Goku struggling to breath with Freeza laughing at him struggling to get his head the water. There's also the fact that even a SSJ can get sick just like any normal human can through biological means. Radiation in space is a lot more harsh than any normal illness you may require on Earth and Goku is no longer beneath the protective layer of the Ozone and such so he's getting bombarded with an insane amount of radiation. Goku has shown enough times to be vulnerable to cold temperatures in the manga and anime cold temperatures like him nearly freezing to death in Jingle village without proper clothing to endure the weather.
He's shown multiple times to be vulnerable to high temperatures such as fire, lava, and ect in the anime and movies (Gohan almost killed Broli with lava had he not formed a protective barrier around himself) and to be affected by heat in the same way a normal human would during different hot areas on earth or on other planets during the anime and he's shown he needing normal air by seemingly having a harder time to breath and function after running what might be a short period of time on Kami's look out compared to on Earth.
I seriously doubt Goku will be just fine, filler or not.
As for the topic, its difficult to compare Goku's speed to Superman because Toriyama doesn't give stated time and distance for Goku and friends that much and when he does it contradicts something before or after it considering he's basically inconsistent in displaying their feats of speed/strength levels. I guess the best we could do is use Goku from the Buu arc just before the ten year time skip at the end. The last known stated time and distance during the Buu arc for Gohan. Before we begin we have to figure out how much power Gohan lost from not training for the seven years. Folks' opinion on this vary, but for me I don't think he dropped any lower than 75% his original full power as a kid. Now do SSJ2 Majin Vegeta and Goku compare to kid SSJ2 Gohan from back then? Vegeta states Goku's full power as a SSJ2 exceeds Gohan's, but by how much? There's a quote is from Piccolo about Majin Veget's SSJ2 form at full power.
Piccolo: “He’s already surpassed Super Saiyan as well…This is tremendous power…Perhaps even greater than Gohan’s when he fought Cell…”
That is pretty similar to the statement he said about Vegeta possibly surpassing Gohan during Early portion of the Artificial Humans arc affter he just beat Android 19. Later statements typically take precedence over previous ones and SSJ2 Majin Vegeta is stated marginally stronger than SSJ2 kid Gohan and Vegeta is equal to Goku's SSJ2 form so they both might be anywhere from 5-10% stronger than SSJ2 kid Gohan's power making them anywhere from 30-35% higher than teen SSJ2 Gohan. That's between a 1.4-1.466x stronger than teen SSJ2 Gohan which is more than enough difference to be considered far stronger than him. Base Gohan just a month before the 25th Budokai stated it would take him 20 minutes to travel from his home to school which was 621.3712 miles away.
So....Base Gohan would be about mach 2.449 taken that into account, SSJ would make him mach 122.45 and SSJ2 mach 244.9. SSJ2 Goku and Majin Vegeta are potentially mach 342.86-359.023. Assuming base Gotenk before the Rosat (Room of Spirit and Time) training is a mean estimate of Vegeta (Highest estimate) and Gohan's SSJ2 speed levels base Gotenks would be around mach 301.9615 so as a SSJ he would be able to cover 3192.319 mps. The Earth's circumference is 24,901.55 miles at the equator so it would take SSJ Gotenks about 7.8 second or so to make one full trip around the planet. Gotenks told Piccolo he flew around the Earth several times in the Japanese version and he's showing making about five trips in that one panel so it would take SSJ Gotenks 39 seconds to make five trips around the planet. Twice the time if we take the panel of him flying twice the Earth's circumference at face value which is more than enough time to do that. The only problem is this is more of a rough estimate, the speed could greatly increase or decrease depending where go Goku, Vegeta, Piccolo, Goten, Trunks, and Gotenks rank against Gohan as the measuring stick.
