As astronomers continue discovering unusual worlds beyond our solar system, many say the question that divided scientists in ...

The spacecraft is currently approaching the outer boundary of the solar system as it prepares to cross into interstellar space.

Twenty years after Pluto lost its planet status, the debate is suddenly alive again. After a 10-year-old wrote to NASA asking ...

After a nine-year journey, New Horizons transformed Pluto from a distant blur into a world of towering mountains, flowing ...

Those who supported Pluto’s demotion included Neil DeGrasse Tyson ...

A 24-year-old observatory assistant from the Midwest discovered Pluto. Clyde Tombaugh, born in 1906 in Streator, Illinois, grew up fascinated with the solar system. A self-taught astronomer, he built ...

On the 20th anniversary of Pluto’s infamous demotion, Mike “Pluto Killer” Brown explains why any reversal of that decision would be driven more by nostalgia than science ...

Unpopular opinion time, Pluto being reclassified as a dwarf planet was a great thing for our understanding of the solar system and for the former planet, too.

New Horizons' instruments may be shut off before it reaches the Solar System's "termination shock", despite it being fully functional likely into the 2050s.

Pluto lost its planethood for a very specific reason. Whether or not that’s a good reason depends on who you ask.

NASA chief Jared Isaacman has doubled down on his stance that Pluto is without a doubt a planet. For two decades, controversy has surrounded the distant icy world after it was infamously stripped of ...