The giant planet WASP-17b is the largest known planet humanity has observed. With a diameter of 249,000km, WASP-17b is almost twice the size of Jupiter. It also may be the least dense planet currently known, with a density about 6-14% that of Jupiter.
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The largest comet, Hale-Bopp, and is named after the two men who discovered it in 1995 despite being hundreds of miles away from each other. 00:21
The Phoenix Cluster black hole has a diameter of 100 billion kilometers, which is 18 times the distance of the sun to Pluto. 06:05
The largest quasar group is Huge-LQG, and is believed to contain 73 quasars. 10:32