A thin, stubbornly bright line showed up in data from the MeerKAT radio telescope that did not fit the usual rules of ...

At Lijiang Observatory in southwestern China, the signal did not arrive as a neat, steady beam. It came down from a satellite ...

If you have ever peered down a highway on a sunny day, you have probably seen the rising, wavelike ripples of heated air that distort the appearance of objects near the horizon. Similar disturbances ...