Vagabonds of the Solar System. Chapter 17. Guiding Questions. How and why were the asteroids first discovered? Why didn’t the asteroids coalesce to form a single planet? What do asteroids look like? How might an asteroid have caused the extinction of the dinosaurs?
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The asteroids are the relics of planetesimalsthat failed to accrete into a full-sized planet, thanks to the effects of Jupiter and other Mars-sized objects.
Irons and stony irons are fragments of the core of an asteroid that was large enough and hot enough to have undergone chemical differentiation, just like a terrestrial planet
coma (of a comet)
iron meteorite (iron)
near-Earth object (NEO)
nucleus (of a comet)
radiant (of a meteor shower)
stable Lagrange points
stony iron meteorite
stony meteorite (stone)
tail (of a comet)
Widmanstätten patternsKey Words