In recent years, NASA's Kepler space telescope and other observatories have discovered more than 1,800 extra-solar planets, with thousands of additional"candidate" planets awaiting confirmation.
Since 2014, NASA's Kepler space telescope has confirmed the existence of hundreds of distant worlds, and its findings have hinted at potentially 2,300 more.
The 305 worlds on the initial list were all discovered before 2009, which means the list excludes all the planets discovered by NASA's Kepler space telescope.
Although there are only four large planets in our own solar system, astronomers have discovered thousands outside of it, particularly using NASA's Kepler space telescope.
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