nothing!

5. Besides, the angelic heaven is so immense that it corresponds to
each single part in man, myriads [of angels corresponding] to each
member, and organ, and viscus, and to each affection of them; and
it has been given me to know that this heaven, as to all its
correspondences, cannot possibly exist except from the inhabitants of
very many earths[f].

[Footnote f: Heaven corresponds to the Lord, and man, as to all things
in general and particular, corresponds to heaven; and hence heaven,
before the Lord, is a Man in a large effigy, and may be called the
Grand or Greatest Man, nos. 2996, 2998, 3624-3649, 3741-3746, 4625.
Concerning the correspondence of man, and of all things pertaining to
him, with the Grand Man, which is heaven, in general, from experience,
nos. 3021, 3624-3649, 3741-3751, 3883-3896, 4039-4055, 4218-4218-4228,
4318-4331, 4403-4421, 4523-4533, 4622-4633, 4652-4660, 4791-4805,
4931-4953, 5050-5061, 5171-5189, 5377-5396, 5552-5573, 5711-5727,
10030.]

6. There are spirits whose sole study is the acquisition of knowledges
finding in them their only delight. These spirits are therefore
permitted to wander about, and even to pass beyond this solar system
into others, and procure knowledges. They have stated that there are
earths in immense numbers, inhabited by human beings, not only in this
solar system, but in the starry heaven beyond it. These spirits are
from the planet Mercury.

7. With regard, in general, to the Divine worship of the inhabitants
of other earths: all there, who are not idolaters, acknowledge the