AST201H1 Chapter 11: Chapter 11 ASTRO.docx

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2 Apr 2012

School

UTSG

Department

Astronomy & Astrophysics

Course

AST201H1

Professor

Michael Reid

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AST201H1 Full Course Notes

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All 4 jovian planets share the properties of immense size and a low density composition of hydrogen, helium and hydrogen compounds. Jupiter and saturn are made almost entirely of hydrogen and helium with only a few percent of their masses in the form of hydrogen compounds and even less in the form of rock and metal. Composition similar to sun rather than terrestrial planets. Uranus and neptune are made primarily of hydrogen compounds such as water, methane, and ammonia and with smaller amounts of metal and rock. Jovian planets formed in the outer solar system, where it was cold enough for hydrogen compounds to condense into ices. Some the ice rich planetesimals grew to great size due to the abundance of hydrogen compounds. Neptune"s high density is due to the icy rich planetesimals it formed from. Astronauts use the movement of clouds to determine the rotational period of a jovian planet.

Related Questions

Which of the following is not true about the terrestrial and jovian planets?

A) The terrestrial planets that do have solid atmospheres made of heavier compounds in general than the atmospheres of the jovian planets.

B) The jovian worlds have many moons as compared to Terrestrial worlds.

C) The terrestrial worlds have a compact and rocky surface, whereas the jovian worlds are giant and gaseous.

D) All Jovian planets have retrograde motion and have orbits that have a high inclination to the ecliptic as compared to terrestrial worlds.

E) The terrestrial worlds have closer orbit whereas the orbits of the Jovian worlds are far.

Which, if any, of the following statements is/are true?

1)Our galaxy, The Milky Way, is a member of The Local Group, whichis one of several groups of galaxies located in the VirgoSupercluster.
2)Most astrophysicists believe that our Solar System formed from animmense cloud of gas and dust about 4-1/2 million years ago.
3)Planets are believed to have formed by a process known asaccretion.
4)Two key elements in the Condensation Theory of PlanetaryFormation are 5)Conservation of Angular Momentum and CondensationNuclei.
6)The name of the second largest object in the Universe is TheSouthern Wall.
7)In our Solar System, the four jovian planets, Jupiter, Saturn,Uranus, and Neptune, are separated from the four terrestrialplanets, Mercury, Venus, Earth, and Mars, by the Kuiper Belt.
8)Our star, The Sun, is located on the Orion Arm, about 26,000light-years from the center of the Andromeda Galaxy.
9)It takes a photon of light about 4-1/5 years to travel from ourSolar System to the second closest star to Earth, ProximaCentauri.
10)The full range of human knowledge about our Universe spans about40 or 41 orders of magnitude on a spatial scale and about 13.7billion years on a temporal scale.
11)It takes a photon of light about 5-1/2 hours to travel from theSun to the orbit of the former planet Pluto.

why do jovian planets bulge around the equator, that is, have a "squashed" appearance?

A) They are much more massive than the terrestrial planets.

B) Their large systems of moons and rings gravitationally attract the mass around the equator more.

C) Their rapid rotation flings the mass near the equator outward.

D) Their internal heat sources exert a pressure against the sides of the planets.

E) all of the above

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AST201H1 Chapter 11: Chapter 11 ASTRO.docx

AST201H1 Full Course Notes

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