The amateur astronomer who discovered Pluto and visited the dwarf planet after his death
Astronomy
Astronomy
Solar System
If we discovered another planet in our Solar System, what would we call it?
A new planet needs a name – but what we would we call it if it was found in our Solar System?
Solar System
How big is a dwarf planet?
Measuring the size of these pint-sized worlds is more complicated than it seems…