negasphere

"Like the Bergenholm, the negasphere can never really make up its mind about gravity." and there you have it.

Science Fiction, Fantasy, Horror: Backstage Lensman - Randall Garrett Blue Tyson 2006

If a planet had emerged, it was met by a negasphere ...

Children of the Lens Smith, E. E. 1954

What happened when planet met negasphere, in the unknown medium which makes up the "interior" of a hyper-spatial tube, is not surely known.

Children of the Lens Smith, E. E. 1954

Then, if there was time, and because the theory was that the pirates would probably send a negasphere through first, with an intrinsic velocity aimed at Arisia, a suitably-equipped loose planet was tossed into "this end" of the tube.

Children of the Lens Smith, E. E. 1954

Since they might send a loose or an armed planet through first, however, the fleet admiral usually threw a negasphere in, too.

Children of the Lens Smith, E. E. 1954

Thus, when the spherical hyper-plane which was the aspect of the negasphere tended to occupy the same three-dimensional space in which the loose planet already was, there was no actual collision.

Children of the Lens Smith, E. E. 1954

Mathematically, it was a sphere, or rather a negasphere, about the size of a baseball; but the eye, while it could see something, could not perceive it analytically.

Gray Lensman Smith, E. E. 1950

For, as has been said, the negasphere was composed of negative matter.

Gray Lensman Smith, E. E. 1950

The master technician had cut his controls and every pound of metal and other substance surrounding the negasphere had fallen into that enigmatic realm of nothingness.

Gray Lensman Smith, E. E. 1950

The substance of the planet vanished, the incomprehensible nothingness of the negasphere faded away into the ordinary vacuity of empty space.

Gray Lensman Smith, E. E. 1950