Lunation 1261 The Sun burns, but it's not on fire Space & Astronomy News The Kepler-51 system is fascinating because of its three very low density planets, which are so large and inflated they are known as "super puffs" (and featured in my video on extreme exoplanets). And scientists just found a fourth planet in the system! It remains to be seen if this planet is just as puffy as the others.New planet in Kepler-51 system discovered using James Webb Space Telescope It's not exactly...