Doesn't mean the planet.
"Heaven and earth will pass away, but my words will never pass away"
Heaven and earth in Genesis is not what is taught. It's the upper and lower kingdoms.
“Woe to you, teachers of the law and Pharisees, you hypocrites! You shut the door of the kingdom of heaven in people’s faces. You yourselves do not enter, nor will you let those enter who are trying to."
Remember, as it was in the days of Noah, so it is at the coming of the Son of Man. In the days of Noah, the FIRMAMENT separated the "waters above" from the "waters below". Revelation 17:15 tells you what the waters, where the PROSTITUTE sits, stand for… People, multitudes, nations, and languages.