A possible meteor sighting over Ohio and Pennsylvania startled residents, leading to emergency calls. Meanwhile, astronomers ...

The celestial phenomena known as “Steve” and “Picket Fence,” named for their unique appearances, were once thought to be auroras. However, recent studies suggest they are distinct phenomena. “Steve,” ...

Thanks to Fink, a software package created by two CNRS engineers, it is now possible to track millions of transient celestial phenomena observed in the sky by the Vera C. Rubin Observatory in Chile, ...

Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF. The greatest distance in its orbit of the Moon from the Earth; may also be applied to ...

How could ancient astronomers observe and describe celestial phenomena with such precision without our modern instruments? This question finds new illumination thanks to Chinese writings nearly three ...

Both of Friday’s Astronomical Unit lectures are related to celestial phenomena not discernible to human senses. David Grossman (left) explores how “sonification” represents the sounds of space, and ...

A conjunction is an astronomical event in which at least two planets – or, in this case, other celestial bodies – appear to our vantage from Earth to be close together in the sky. The trio of ...