Astronomy 1021 Lecture Notes - Lecture 12: Oort Cloud, Europa Europa, 52 Europa
4 Oct 2018
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Document Summary
Comet sightings affect people" actions bemuse of their beliefs. Naked-eye planets from antiquity: mercury, venus, mars, jupiter and saturn. Contains about one third of total mass in asteroid belt. But almost twice as dense (rocky); undergone differentiation. Major impact in past leaving big crater and spawning lots of little vestas. Why an asteroid belt and not a planet. A small (grain- to boulder-sized) particle of debris in the solar system. The bright trail left by a meteoroid that enters earth"s atmosphere. A portion of a meteoroid that survives its passage through the atmosphere and impact with the ground. Another word for atmospheric science ; has only little to do with meteors. Unchanged un composition since they first formed 4. 6 billion years ago. Large impact remove material from moon and mars. A few hundred million years younger than primitives. Giotto (esa); closet at 596 km thanks to collaboration! Rosetta (esa) 2014- september 2016; comet churyumov-gerasimenko with lander philae.
