It might all sound rather esoteric, for it is unlikely an alien civilisation does exist—at least within the range of anysort of broadcast that is currently possible.
这些也许听起来相当深奥难懂，因为外星文明未必真的存在——但至少在各种形式的广播范围内，目前来说是可行的。
If that really is where is came from, it would have had to be a pretty powerful astronomical event - or an advanced alien civilisation using an astonishingly large and powerful transmitter.
如果他真的是来自那里，它必将是一个非常强有力的天文事件——或者说，一个先进的外星文明正在使用一台大得令人吃惊的强力发射机。
They suggest that any alien civilisation worth its salt would alight not on the photons of the electromagnetic spectrum-whether optical or radio-frequency-to send messages to other solar systems.
他们指出，任何有头脑的外星文明都不会发射电磁波谱中的光子——无论是可见光波段还是射频波段——向另一个太阳系传送信息。
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