To find the answer, read ever passage where they are mentioned in the Bible. My ans, from 52 yrs of study is: The Kingdom of Heaven /God is God's work in the hearts of men since day one of creation. ( which was about 6,000 yrs. ago. )It is the spiritual Church which the eternal son of God, (who became Jesus only 2,000 yrs ago) has been building for 6,000 yrs. Now the new earth, is the new earth, This old earth was once destroyed by water,(Noah's time), In the future, at least 1,000 yrs. from now, , the earth will be destroyed by fire, and God will recreate it for our, (Christians) dwelling place, with Jesus, for ever. Hoffco