Let me be weird for a moment.
The Bible said God created the heavens and the earth, so I don't know if heaven is in the clouds or in space or beyond space and not visible to the mortal eye. But, the last time I was on a plane, I looked at a bed of clouds and imagined heaven was inside of them.
I imagined the spirits of everyone I ever knew who had passed away had become a part of that cloud. And when my plane went down into those clouds and inevitably experienced turbulence, I imagined that everyone I ever knew who had passed away was trying to get on the plane and hug me. And I felt their love as it rocked my plane. And I was comforted.