PHYS 183 Lecture Notes - Lecture 32: Tidal Force, Exoplanet, Radiation Pressure
21 Apr 2018
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Less obvious on saturn due mainly to its lower mass, hence less compressed at(cid:373)osphe(cid:396)e the(cid:374) jupite(cid:396)"s: mainly hydrogen atmosphere. Rings are not solid: made up of millions of highly reflective ice covered rocks, few cm to few m. Atu(cid:396)(cid:374)"s (cid:396)otatio(cid:374) axis at (cid:1006)(cid:1011) deg to e(cid:272)lipti(cid:272) Jupiter: 67 known moons: 4 galilean moons. Tidal deformations stretch and strain io, (cid:272)ause (cid:862)tidal heati(cid:374)g(cid:863) due to friction. Next further out; roughly same size as io, but half the mass. Many cracks, folds seen in ice, due to tidal stress. Suggestive of liquid ocean of water below ice layer that is a few km thick. Found mainly in asteroid belt between mars and jupiter. Range in size up to 1000 km (ceres) Composed of head (or coma) and tail. Centre of head is solid nucleus: dirty ice: water, methane, ammonia, carbon dioxide. Remains of comets create occasional showers of meteors. Quick streak of light across the night sky.
