One study suggests that objects above 10 MJup formed through gravitational instability and should not be thought of as planets. Optical albedo decreases with increasing mass, because higher-mass giant planets have higher surface gravities, which produces lower cloud-column depths. [146] Planets with an eccentric orbit could be locked in other resonances. Lowering the temperature increases optical albedo even without clouds. But eventually more planets of other sorts were found, and it is now clear that hot Jupiters make up the minority of exoplanets. [45], Claims of exoplanet detections have been made since the nineteenth century. [27] [57] These pulsar planets are thought to have formed from the unusual remnants of the supernova that produced the pulsar, in a second round of planet formation, or else to be the remaining rocky cores of gas giants that somehow survived the supernova and then decayed into their current orbits. The best-fit albedo measurements of HD 189733b suggest that it is deep dark blue. Our solar system is usually gone over in elementary school, so you might just need a refresher course about the planets in order in our solar system. 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