A superior conjunction occurs when Venus is the farthest from Earth, on the other side of the sun. Conversely, astronomers ...

"Chicagohenge" is when the sun lines up with our beautiful skyline, beaming down between the skyscrapers in the heart of the Loop. This happens on the first day of spring, which was Thursday, and ...

The shadow of the Blue Ghost spacecraft after it landed on the moon, with Earth in the distance. Blue Ghost just completed its mission, which lasted a full lunar day — two Earth weeks — on the near ...