The terminology you are using is confusing. The NLT is a bad translation.
The KJV does a much better job...
1 Corinthians 15:44
"It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body."
- Natural Body
- Spiritual Body
They are synonymous with these descriptors...
1 Corinthians 15:48
"As is the earthy, such are they also that are earthy: and as is the heavenly, such are they also that are heavenly."
When combined, we have...
- Natural/Earthly Body
- Spiritual/Heavenly Body
And guess what?
They are *both* 'physical', as in comprised of Atoms.
Thus...
a) A physical body
*can* ascend into the sky, defying gravity.
b) A physical body
*can* exist in heaven since heaven
*is* a physical world.
The New Heavens and New Earth is not some 'ethereal' place where people float around like ghosts. It is made of particles as well, though the physics may be different.
You said:
When combined, we have...
- Natural/Earthly Body
- Spiritual/Heavenly Body
And guess what? They are *both* 'physical', as in comprised of Atoms.
Why do you think that a Spiritual/Heavenly Body is physical (comprised of Atoms)? What is your evidence?
That is not what the Bible says.
The Bible says that the bodies we will have in heaven are
different from the bodies we have on earth (1 Cor 15:40, 44).
The Bible also says the our physical bodies cannot exist in heaven (1 Cor 15:50).
Then the Bible says that our bodies will be
changed (from physical bodies into spiritual bodies) (1 Cor 15:51).
1 Corinthians 15
KJ21
40 There are also celestial bodies and bodies terrestrial; but the glory of the celestial is one, and the glory of the terrestrial is another.
44 It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body
50 Now this I say, brethren, that flesh and blood cannot inherit the Kingdom of God; neither doth corruption inherit incorruption.
51 Behold, I show you a mystery: We shall not all sleep; but we shall all be changed
ESV
40 There are heavenly bodies and earthly bodies, but the glory of the heavenly is of one kind, and the glory of the earthly is of another.
44 It is sown a natural body; it is raised a spiritual body. If there is a natural body, there is also a spiritual body.
50 I tell you this, brothers: flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable.
51 Behold! I tell you a mystery. We shall not all sleep, but we shall all be changed,
KJV
40 There are also celestial bodies, and bodies terrestrial: but the glory of the celestial is one, and the glory of the terrestrial is another.
44 It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.
50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
NIV
40 There are also heavenly bodies and there are earthly bodies; but the splendor of the heavenly bodies is one kind, and the splendor of the earthly bodies is another.
44 it is sown a natural body, it is raised a spiritual body. If there is a natural body, there is also a spiritual body.
50 I declare to you, brothers and sisters, that flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable.
51 Listen, I tell you a mystery: We will not all sleep, but we will all be changed—
NKJV
40 There are also celestial bodies and terrestrial bodies; but the glory of the celestial
is one, and the
glory of the terrestrial
is another.
44 It is sown a natural body, it is raised a spiritual body. There is a natural body, and there is a spiritual body.
50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; nor does corruption inherit incorruption.
51 Behold, I tell you a mystery: We shall not all sleep, but we shall all be changed—
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You said:
Thus...
a) A physical body *can* ascend into the sky, defying gravity.
b) A physical body *can* exist in heaven since heaven *is* a physical world.
The New Heavens and New Earth is not some 'ethereal' place where people float around like ghosts. It is made of particles as well, though the physics may be different.
Why do you think that heaven is a physical world? What is your evidence?
Why do you think The New Heavens and New Earth is all one dimension? What is your evidence?
I believe that the New Earth refers to this physical world, it is the Kingdom of God on earth that Jesus told us to pray for.
The Kingdom of God is already in heaven, as the verse below says - "as it is in heaven".
Matthew 6
9 After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name.
10 Thy kingdom come, Thy will be done in earth, as it is in heaven.