That's a good point, Earth would be a nice place to live if their home planet had comparable gravity. But conversely, Earth could also be very uncomfortable for

That's a good point, Earth would be a nice place to live if their home planet had comparable gravity. But conversely, Earth could also be very uncomfortable for them for a multitude of reasons. Like imagine if we discovered a planet full of life, but it had a dense very wet atmosphere that to us would be unbearable, but to the native species perfect. Also imagine if humans do go out and colonize new planets, these people would go through rapid changes morphing into another subspecies each adapted to conditions of the planet they moved to.