1 The life stream stopped Meteor
As Holy failed to stop Meteor and even had an opposite effect, as it was about to get rid of some humans according to Bugenhagen's theory, the life stream stepped in and stopped Meteor. See summary of final fantasy 7 story.
2 The planet was saved
According to the movie, Final Fantasy: Advent Children, which is considered the extension to FFVII story, the planet and humans survived.
3 Cloud and his friends lived
According to the movie, Cloud and his friends survived and were not killed by the planet. Cloud and many of his friends showed up in the movie which takes place 2 years after the events in the FFVII game.
4 Midgar was destroyed
According to the movie, Midgar was destroyed before the life stream saved the rest of the planet.
5 Midgar's people escaped
Many of Midgar's people escaped, according to the movie, and founded the new city which was called Edge.
6 Life flourished on the planet
In the final scene of the ending of the game, it's clear that the planet reached a healthy state as green plants covered Midgar fully, while many birds were seen flying. See why many people loved FFVII.
7 Aeris' soul was still around
In Final Fantasy: Advent Children, Aeris' soul spoke to Cloud. In addition, during the ending of the game Aeris was seen as if she was overlooking what happened. This made many people conclude that Aeris is alive but in a different form.
8 Marlene lived
According to the movie, Marlene was still alive and she was living with both Cloud and Tifa, in addition to another orphan called Denzel.
9 'I think I can meet her there'
No clear explanation was found for this phrase which Cloud said after defeating Sephiroth, but popular fan theories suggest that this could either happen after Cloud dies then goes to the promised land or inside the life stream where the dead can speak with the living.
10 People lived happily on the planet
The happy cries heard at the last few seconds of the ending of the game signify that people lived in happiness after the planet was saved. See why Final Fantasy games are too long.