Astrobiology Magazine has an interesting article on the continuing debate over the status of Pluto. Mark Sykes of the Planetary Science Institute debated the always charismatic Neil deGrasse Tyson recently on the IAU's decision to "demote" Pluto from planet status to dwarf planet status. This is an issue which can provoke a lot of passion when lay people, let alone scientists, debate it.One of the most interesting things about the article is that as our knowledge of the planets has grown, the community of people which studies them has grown as well.
"When I first started in this business, a large fraction of planetary scientists were astronomers who had cut their teeth on Earth-based telescopes," Sykes said. "Since then, we've been flooded with data coming back from close flybys, orbiters, landers and rovers. Most of the planetary science questions being asked today are geophysical and geological. Planetary science is merging with terrestrial science to become real comparative planetology. Only a small fraction of the planetary science community belongs to the IAU anymore."That's a pretty surprising thing to a lay person like myself. Most of the people who study planets these days aren't necessarily astronomers, they are geologists, physicists, chemists and all sorts of other flavors of scientist. No wonder it's so hard for people to agree on these things.
It's interesting thing to see the sausage being made as scientists debate an issue in public. While Pluto's status is a thorny issue, it's a fairly easy to understand issue. It's not obscure or difficult to understand like dark matter or dark energy. Everyone has heard of Pluto and seen pictures of Pluto and knows a lot of the facts that are being argued over in this debate. Perhaps this is why it's so compelling.
"It's good for people to know that debate in science is the norm," Sykes said. "Science is dynamic. Science is argumentative. Science is continual testing and challenging. Science is not about something everyone has to memorize because some organization has given it its blessing."
