In 2006 the International Astronomical Union made a decision that broke hearts around the world. Pluto — beloved, distant, discovered by an American — was stripped of its planet status and reclassified as a dwarf planet.

Twenty years later the debate is far from over.

NASA Administrator Jared Isaacman just told the US Senate that he is firmly in the camp of making Pluto a planet again. NASA is working on papers to escalate the discussion through the scientific community and push for a formal revisitation of the 2006 decision.

And he has a point.

The IAU's definition requires a planet to clear its orbit of debris. Pluto failed that test because it shares the Kuiper Belt with other objects. But here is the thing — Earth shares its orbit with asteroids. So does Jupiter.

So why was Pluto singled out?

Pluto has towering mountains. Vast nitrogen-ice glaciers. A heart-shaped landform named after its discoverer Clyde Tombaugh. NASA's New Horizons spacecraft flew past it in 2015 and revealed a stunningly diverse world that looks a lot more like a planet than a lump of rock.

Tombaugh discovered Pluto in 1930. It was a planet for 76 years. It deserves to be one again.

The ultimate decision lies with the IAU. We are calling on the IAU to reopen the debate on Pluto's classification and restore its planet status once and for all.

Sign this petition and tell the IAU: make Pluto a planet again.