The world has changed pretty drastically over the past few decades.
Technology advanced, lives got longer, people started donating more to Africa. You get the gist.
Oh, and pretty recently something about the human genome has changed. Some people started producing a new energy- one that gave them superpowers. It was like something right out of a comic book. There weren't heroes like in the stories though. People are innately self driven and these powers were... not used to benefit much of anyone.
The world changed. These gifted individuals might have had power, but the regulars had numbers, and fear, and religions, and weapons that fired high calibre lead at supersonic speeds which pretty much put anything that wasn't made of stone down as quick as a regular person. They had to find other means for the golems.
More of these... metahumans began popping up around the globe, and while there were the bad apples- there were the good ones too. The ones that were paramedics using their electricity to revive their patients, or using their ability to read minds to teach more effectively. The comic books ended up being pretty inaccurate. There weren't many of them, less than a thousandth of the population. Do the math though- in this world that's still over ten million people.
The world saw that these people could slaughter and burn, but it also saw that it could save lives and innovate. The world called for change again- To train these gifted people to push the world forward through academies and learning programs, and the world came together towards one common goal.
A promise for a greater tomorrow.
Not to be confused with The Promise of course.
The Promise is the world's most incredible endeavor yet. An Academy in orbit.
A city in the sky.
The Promise is where you're going, actually. You've either been chosen through a draw and agreed to go to school in a giant space station 22,000 miles away from the ground, or you've been dragged there kicking and screaming to to taught how to be civil or to be ejected into space for the safety of those around you.
Oh, and before I go- yes, you can turn the gravity off.