CP-2156 Life In The Universe

Figure 4. One of the most crowded regions of the radio signature of Earth: calculated spectra of 0.1-Hz-wide video carriers fro Channel 3 (62.260 MHz) as observed from the star Kruger 60 at a distance of 12.9 light years. The four Greenwich sidereal times (GST) cover the period during which the star scrapes the northern horizon at lower culmination as seen from the United States. The illustrated frequency offsets arise solely from the Doppler shift due to the rotation of Earth; in reality, the degree of crowding is much less since the frequencies of video carriers often wander by as much ±200 Hz from their assigned frequencies. Individual stations are labeled by numbers.

Figure 4. One of the most crowded regions of the radio signature of Earth: calculated spectra of 0.1-Hz-wide video carriers fro Channel 3 (62.260 MHz) as observed from the star Kruger 60 at a distance of 12.9 light years. The four Greenwich sidereal times (GST) cover the period during which the star scrapes the northern horizon at lower culmination as seen from the United States. The illustrated frequency offsets arise solely from the Doppler shift due to the rotation of Earth; in reality, the degree of crowding is much less since the frequencies of video carriers often wander by as much ±200 Hz from their assigned frequencies. Individual stations are labeled by numbers.

- Back -