Planet the Drake equation, which estimates the number of intelligent, communicating civilizations that exist in the Milky Way. There are exoplanets that are much closer to their parent star than any planet in the Solar System is to the Sun, and there are also exoplanets that are much farther from their star. Mercury, the closest planet to the Sun at 0.4 AU, takes 88 days for an orbit, but the shortest known orbits for exoplanets take only a few hours, e.g. Kepler-70b. The Kepler-11 system has five of its planets in shorter orbits than Mercury's, all of them much more massive
Stowaway to the Mushroom Planet end of the book, Horatio Peabody learns his lesson about the arrogance of his scientific beliefs, and the situation, overall, returns to equilibrium until the next book. Stowaway to the Mushroom Planet " Stowaway to the Mushroom Planet "is the second in the series of "Mushroom Planet" books by Eleanor Cameron, and was published in 1956, two years after "The Wonderful Flight to the Mushroom Planet". This children's book is set in a beach community in California, as well as on a tiny, habitable moon, "Basidium", in an invisible orbit 50,000 miles from Earth. The "Mushroom Planet," visited by the