Every dishonest signal weakens the integrity of the signalling system, and so reduces the fitness of the group.

Strong signals weaken within a few billion miles.

And their signal is weakening; they may be drawing down their emergency power reserves.

When the distance was doubled, the signal weakened at the receiving end to 1/64th.

"Seems to me the signal would weaken and become distorted the deeper it goes," said Mercier.

That is because the signal rapidly weakens with distance.

But both teams have since announced that the signals have weakened, although they have not ruled out its existence within that range.

Now both teams have announced the signals have weakened, though they have not ruled the existence of the Higgs within that range.

A diminished ship's voice said urgently but faintly, "Your signal is weakening. "

Your signal is weakening, Captain, but we still have you.