As far as I can tell, TNT will only launch TNT. Which will then explode, destroying anything nearby. Everything else is immediately destroyed by TNT. I turned a mountain into a crater like this, by partially hollowing out the inside and loading it up with TNT.
Except obsidian, which is completely unaffected.
There are 10 types of people in the world. Those that know binary, and those that don't. Gamertag: Talon Omega
You can launch yourself with TNT you just need diamond armor and to know how to set it up. It also helps to have water around your launch pad. Just know its risky and the surrounding area gets blown up.
GT: ozy8080. Blame the OCD and autocorrect. If your not playing a GAME for FUN your doing it wrong.
I already know how to launch my self, but i wanted to start a minecraft space program obviously i know you cant get to space, but it would be really cool to build rockets out of obsidian and launch it with tnt, they should allow that it would be so awesome.