It is distinguished by its irregular shape, its chaotic rotation, and its unexplained sponge-like appearance.

Adams is increasingly terrified by the unexplained appearances of the hitch-hiker.

Her sudden, unexplained appearance in the pulps annoyed readers and generated a flurry of hate mail printed in The Shadow Magazines letters page.

The game is set during a series of unnatural disasters across Planet Earth due to unexplained appearances of large crystals, where the Vortaak alien race are invading once again.

If they'd been posted around the gate they would have had us as soon as we stepped through-if our sudden, unexplained appearance hadn't sent them running and screaming in all directions first.

An unexplained appearance on the trend list can indicate many things - including a sudden death.

Henry's unexplained appearance, the wangled petrol, the inadequate excuse-he was sharply attracted by Shirley.

The fact that a larger segment of the public would not only notice, but investigate, the unexplained appearance of the stickers was something I had not contemplated.

Another was the sudden, unexplained aPPearance of the Believer Words such as "superon."

Several other unexplained appearances follow.