I work on several observing campaigns currently trying to answer these questions! (ebpetroff.com)
That's according to Karl Battams of NASA's Comet ISON Observing Campaign on this week's show. (planetary.org)
«This planet has been the target of multiple large observing campaigns with both Hubble and Spitzer, and yet we are still trying to figure out the answers to basic questions about the composition of its interior and — if it has one — its atmosphere,» Knutson says. (scientificamerican.com)