: An Iranian Shahed exploding drone launched by Russia flies through the sky seconds before it struck buildings in Kyiv, 17 ...

See January's full Wolf Supermoon rise in twilight on Saturday, Jan. 3, 2026 — the year's highest and one of the brightest ...

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As we call time on the first quarter of the 21st century, I thought it might be a good opportunity to look back at some of ...

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アマチュア無線の醍醐味の一つが「世界のどこかにいる見知らぬ人と交信する」ことであり、なるべく遠くまで電波を届ける遠距離無線通信(DX)はアマチュア無線家の一大目標といえます。DXを行うためには「より高出力の電波を飛ばす」「より高いアンテナを使用する」「短波帯を反射する電離層を利用する」「人工衛星を利用する」など様々な手法が採られますが、その一つに「月面反射通信(Earth-Moon-Earth・E ...