Mars’ strangely small mass still puzzles planetary scientists. Definitive answers as to why are still hard to come by.

Explore daily insights on the USA TODAY crossword puzzle by Sally Hoelscher. Uncover expert takes and answers in our crossword blog.

Earth is full of mysteries that scientists have yet to fully understand. Despite years of research, some phenomena remain ...

NPR's Ayesha Rascoe plays the puzzle with listener Heather Reed of Eureka Springs, Ark., and puzzle master Will Shortz.

A long-standing astronomical puzzle has been solved, as scientists have traced the origin of a mysterious "alien" signal ...

Is the black moon really black? Everything to know about the rare black moon and when to watch the rare celestial event.

For two decades now, the iconic twin Voyager spacecraft have been quietly overturning everything we thought we knew about the ...

With a new month comes new sets of both new arrivals and departures from Microsoft's Xbox Game Pass subscription service.

"This research gets us closer to defending Earth because it gives us a model ... that this exciting piece of the planetary defense puzzle would one day have her name on it. Of course, that's ...

The Moon is far older than we once believed — but its fiery past has kept its true age hidden. New research reveals that, a ...

When NASA’s Dawn spacecraft visited the giant asteroid Vesta, it discovered intriguing channels on the rocky surface, ...

People who haven’t lived in the Pacific Northwest often puzzle (get it?) at how we make it through a long winter defined by ...