1. Western Union installs the first commercial radio beam system.

2. The radio beam came from outer space.

3. A radio beam would extend much farther than a signal of equivalent power that is broadcast in all directions.

4. And the spacecraft's antenna will receive a powerful radio beam from Earth passing through Pluto's atmosphere.

5. Following a radio beam.

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6. However, the radio beam gets wider and wider with distance so that if a star or planet in some distant galaxy was in the direct line, large amounts of the signal would continue straight past it.

7. Like the searchlight beam, the radio beam cannot be made very sharp; it tends to spread.

8. Ironically, the detailed reasons as to how the radio beam is produced may not be important astronomically .

9. By measuring the refraction of this radio beam, we will be able to plot the temperature and density profile of Pluto's atmosphere from high altitude down to the surface.

10. it is far from simply a radio beam passing through a vacuum at "the speed of light".

11. The speed of radio waves through the atmosphere is affected by magnetic fields, and by other phenomena; it is far from simply a radio beam passing through a vacuum at "the speed of light".