The three were thrown to the floor and held there by an awful weight as the lifeboat darted away at the stupendous acceleration of the beam's reaction against the unimaginable mass of the Nevian sky-rover; but the flight was of short duration.

For all its unimaginable mass, despite the unthinkable power of its drive, itlurched like a broken-masted galleon, and Colin's stomach heaved despite the internal gravity field.

With its present unimaginable mass it was subject to the natural laws of the alien time-plane and thus was as good as immovable.

And the unimaginable mass that held the darkness together.

Then, very slowly at first, the unimaginable mass of the vessel floated lightly upward with a slowly increasing velocity.

Vast freighters, under whose unimaginable mass the Gargantuanly braced and latticed and trussed docks yielded visibly and groaningly, crushed to a standstill and disgorged their varied cargoes.

To do so would be to accumulate an unimaginable mass of data, which, if the worst came to the worst, hard-pressed investigators would have to work through with a fine-tooth comb.

Then, easily as a wafted feather, the unimaginable mass of the immense cruiser of space floated upward with gradually increasing velocity.

There seven dully gleaming red pressor rays leaped upon it, backed by all the power of seven gigantic fortresses, held rigidly in formation by the unimaginable mass of the structures and by their twenty-one prodigious tractor beams.