Reversing the technology to use the lens as a transmitter instead of a receiver would enable aliens to beam massively powerful signals across the galaxy, said Dr Drake.
A transmitter coil, 26cm in diameter, can beam up to 15 watts of power to a receiver coil just 4.3cm across.
一个直径26厘米的发射线圈能够无线传输给接收线圈15瓦的功率，传输距离为4.3厘米。
3
By contrast, Voyager 1, the most distant functioning space probe, is using an extremely weak transmitter to beam radio messages back to earth across 10 billion miles of space.