No-one on earth knows the exact location of Heaven or Hell. We are not told that for a reason of course. If we’d know, we’d see it. Might even be the earth and universe is amidst heaven, and those in heaven can watch us, as we can watch the life in an aquarium
Hell though, definitely is not in our earth as some think. Satan and his legions where banned onto earth though, where they also lost their image in which they where created - the image of God. But much later hell was created as a place for them - far off the earth. And after Last Judgement, hell will be so far off all life around God, that hell and it’s inhabitants won’t even come back to our mind. Match Isaiah 65,17 - Lk 17,26–30, Revelation 14,14–21,1.
As hell is eternal and earth is not, hell can’t be in here anyhow.
As to heaven, I often brought the sample „Aquarium“-like amidst heaven - to be watched all the time.
But it’s ever so clear, that we of course aren’t allowed to know where is, for it takes believe to earn (inherit) heaven and live forever together with God.
Christ’s disciples saw Jesus ascending to heaven. His disciples are we. So we saw Jesus Christ ascending to heaven in Acts 1:9 - …and when He had spoken these things, while they beheld, He was taken up; and a cloud received Him out of their sight.