Who are seraphs?
(Is. 6) 1 In the year that king Uzziah died I saw also the LORD sitting on a throne, high and lifted up, and his train filled the temple. 2 Above it stood the seraphim: each one had six wings; with two he covered his face, and with two he covered his feet, and with two he did fly. 3 And one cried to another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory.
The first thing to note is that seraphim (better translated by the plural noun "seraphs") that is creatures consisting of fire ("seraph" literally means "flame") cried to each other. As they need to cry rather than to just speak, they are at very big distance from each other at the heaven.
I think, seraphs are quasars. They are giant plasma formations around black holes in the outer space located at very, very big distance from each other. Quasars are proto-galaxies that is not yet formed galaxies, the stuff the galaxies are created from. Seraphs are computers consisting of plasma.
The LORD here is Christ that is the electromagnetic radiation of the universe ((Jn. 8:12) “… Jesus spoke to them, saying, “I am the light of the world…”” and (Jn. 9:5) “While I am in the world, I am the light of the world.” and (Jn. 12:46) “I have come as a light into the world…” The electromagnetic waves of the Universe are both a Christ's incarnation in the Universe (Jn. 9:5; Jn. 12:46) and full description (Jn. 8:12) of Christ.)
We learn that seraphs can fly that is change their trajectory in the space by will. I think then can move their "hands" not only in the space but in time also.
But probably the most interesting thing here is that seraphs noticed the Earth and that the Earth is full of God's glory. The Earth is the most injured planet in the space and so it received the most of God's grace. Read about this here (extremely interesting).