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Radio astronomers see what the naked eye can’t. As we study the sky with telescopes that record radio signals rather than ...

These sheets contain drawings and pattern pieces attached to sheets that relate to circular shapes. The patterns are cut from paper and metal. The models include: 1. oblique circular cone, OCCO-PL - ...

There's something unusual lurking out in the depths of space: Astronomers have discovered four faint objects that at radio wavelengths are highly circular and brighter along their edges. And they're ...