The shapes can seem to appear out of nowhere: an undulating S-like spiral streaking across the European skies or a glowing orb trailing above the North American coast. Such strange light shows ...

Credit: Bagchi et al, Monthly Notices of the Astronomical Society/DOI 10.1093/mnras/staf229 Scientists are scratching their heads after taking a closer look at 2MASX J23453268−0449256, a spiral ...