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" ... 10.) Protoplanetary disks with gaps. Planetesimals accrete material from surrounding orbits, creating gaps where planets arise. ... "
" ... As solar systems evolve in general, volatile materials are evaporated, planets accrete matter,... [+] planetesimals merge together or gravitationally interact and eject bodies, and orbits migrate into stable configurations. The gas giant planets may dominate our Solar System's dynamics gravitationally, but the inner, rocky planets are where all the interesting biochemistry is happening, as far as we know. In other solar systems, the story can be vastly different, depending on where the various planets and moons wind up migrating to. ... "
" ... If these planets did accrete directly from their star’s protoplanetary disk, rather than by a more random and violent, repeated accretion process, Asphaug says he would not be surprised that they ended up lower density. ... "
" ... Likewise, icing concerns are always at the forefront of air ambulance pilots and ground personnel. When frost or freezing precipitation accrete on the fuselage or rotors a significant reduction in lift occurs. Depending on the extent of the icing, it could prevent the rotors from producing any lift. ... "
" ... On the other hand, stars that end their lives as white dwarfs will get a second chance: if they either accrete enough mass or merge with another object, they can cross a critical threshold that will also lead to a different class of supernova known as a type Ia supernova. All supernovae are thought to arise from one of these two mechanism, with the only differences dependent on which elements are either present, absent, or were once present but were later stripped from the star at some point in the past. ... "