Pluto Is a Wee Bit Bigger Than We Thought

Update, July 13, 3015 at 20:00 UTC: Emily Lakdawalla has also written about this on her blog, with more details. Update 2, July 13, 2015 at 20:30 UTC: There has been some confusion about the uncertainties I quote in Pluto's size below. I was using the numbers from wikipedia (the ± 20 km), but I suspect the uncertainty used there is low (see, for example, this article by astronomer Mike Brown). I'm still looking into this, but Emily Lakdawalla in the article linked in the first update says that ...