In the fall of 2023, Unistellar observers joined forces with the Association Française d’Astronomie (AFA) to take another close look at a familiar visitor: Comet 103P/Hartley 2. This tiny but famously ...

NASA's Deep Impact spacecraft is running on fumes after chasing down two comets in the last five years, but the probe's cosmic work may not be done yet. Deep Impact cruised to within 435 miles (700 ...

Comet Hartley 2 became the fifth cometary target of close-up photography early Thursday and the smallest and most interesting one visited so far, NASA scientists said. Scientists said images of ...