| 1 | Nor are there enough radio galaxies around to account for it. | |
| 2 | Fiber optics are central to another big upgrade of radio telescopes in Europe. | |
| 3 | And for decades radio astronomers have been able to boast that they had the largest telescopes on the planet. | |
| 4 | Currently, he is involved in high-energy particle physics and high-energy neutrino astronomy using radio telescopes. | |
| 5 | Similarly, some sensors already make more efficient use of another scarce resource: radio spectrum. |
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