A river is a river, independent of whether there are other rivers nearby. In science, we call things what they are based on their attributes, not what they're next to.

Pluto is as far across as Manhattan to Miami, but its atmosphere is bigger than the Earth's.

Science is really about individual experts reaching a consensus.

I just think it's patently absurd for scientists to categorize objects on the basis of the numbers of objects that they can remember.

When I started working with NASA in 1989 as part of a mission to send spacecraft to Pluto, I knew it would take at least 10-15 years to see results of my efforts.

I'm the one who originally coined the term 'dwarf planet,' back in the nineteen-nineties.

CSF and its members believe strongly in the exploration of space of all kinds, including commercial purposes.

I actually started my career in planetary science with a master's thesis on Pluto.

Every mission has life-or-death moments.

Of course Pluto is a planet: It's massive enough to have its shape controlled by gravity rather than material strength, which is the hallmark of planethood.