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[AzetSar]

Ran through the thousands of console games already? From "Oregon Trail" to "Ms. Pac-Man" to "PGA Tour Golf," you have an excuse to never work the last hour of the week again. The Internet Archive does, in fact, have old out-of-print video games. Huzzahs and high fives all around! But that's only a small part of the story. In the bigger picture, it turns out that trying to figure out a way to collect and archive games has proven to be a pretty fraught (and surprisingly political) enterprise, especially if you're trying to collect either official reissues or original copies of your favorite old games. For one, a lot of games need an emulator, or a device that can "pretend" to operate like the Nintendo Entertainment Systems or PlayStations (just to name two) of yore. Then there's the not-so-little matter of copyrights, property rights and who exactly owns what. Early games might've been developed by one studio (or even one person) and then acquired by another publisher through a sale - and then enveloped by yet another company in a takeover. The physics of brown dwarfs has continuously improved since the discovery of these astrophysical bodies. The first important developments were devoted to the description of their mechanical structure, with the derivation of an appropriate equation of state, and the modelling of their atmosphere characterised by strong molecular absorption. New challenges are arising with progress in observational techniques which provide data of unprecedented accuracy. The goal of this chapter is to describe some of the current challenges for the theory of brown dwarfs. Those challenges concerns atmospheric dust and cloud, non-equilibrium atmospheric chemistry, the effect of rotation and magnetic fields on internal structure and the very early phases of evolution characterised by accretion processes. The field remains lively as more and more high quality observational data become available and because of increasing discoveries of exoplanets. Indeed, many physical properties of giant exoplanets can be described by the same theory as brown dwarfs, as described in this chapter. china news

















































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