Which transitional word or phrase best completes each sentence? Poor Pluto

Since 1930, Pluto had been known as the farthest planet in the solar system. After further study was possible in 2006,
, the planet was downgraded to a "dwarf planet" since it does not include certain characteristics of the other eight planets.
, Pluto does not dominate its neighborhood, taking in smaller objects with its gravitational force. This newly revised requirement shocked many who had grown up with their favorite ninth "planet."

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