1.   Because digital signals take up little room, there would still be plenty of the new spectrum, worth tens of billions, to auction off.

2.   In analog transmissions, television signals take the form of radio waves that are analogous to the sound and light waves of the source material.

3.   Radio signals take a second to reach the moon, and several minutes to reach Mars.

4.   The computers study both the route those signals take and how long it takes them to get there.

5.   This is why the eyelids get heavy when cholinergic signals take over.

6.   To send high-definition programming, satellite systems would have to reduce the number of channels they offer because a high-definition signal takes up more space.

7.   But how big a problem angina signals can take a while to determine.