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More Precisely 4.2: The Concept of Angular Momentum

More Precisely 4.2: The Concept of Angular Momentum

Tải bản đầy đủ - 38trang

4.3 Formation of the Solar System







These images show possible planetary systems in the process of formation.



© 2017 Pearson Education, Inc.



4.3 Formation of the Solar System







Temperature in the cloud determines

where various materials condense out;

this determines where

rocky planets and gas giants form.



© 2017 Pearson Education, Inc.



4.4 Planets Beyond the Solar System







Many planets have been discovered in other solar systems; this figure compares recently

discovered exoplanets to Neptune and Earth.



© 2017 Pearson Education, Inc.



4.4 Planets Beyond the Solar System







Some planets are discovered through the

“wobble” they create in their parent star’s

orbit.



© 2017 Pearson Education, Inc.



4.4 Planets Beyond the Solar System







Others are discovered through the periodic dimming of the parent star’s brightness.



© 2017 Pearson Education, Inc.



4.4 Planets Beyond the Solar System







These are the orbits of many extrasolar planets discovered so far. Most have masses

closer to that of Jupiter than that of Earth.



© 2017 Pearson Education, Inc.



4.4 Planets Beyond the Solar System







These are the orbits of many extrasolar planets discovered so far.



© 2017 Pearson Education, Inc.



4.4 Planets Beyond the Solar System







This plot shows the masses of many

extrasolar planets discovered so far. Most

have masses closer to the mass of Jupiter

or Neptune than that of Earth.



© 2017 Pearson Education, Inc.



Summary of Chapter 4







The solar system consists of the Sun and everything

orbiting it.













Asteroids are rocky, and most orbit between the orbits of Mars and Jupiter.

Comets are icy and are believed to have formed early in the solar system’s life.

Major planets orbit the Sun in same sense, and all but Venus rotate in that sense as well.

Planetary orbits lie almost in the same plane.



© 2017 Pearson Education, Inc.



Summary of Chapter 4, cont.











Four inner planets—terrestrial planets—are rocky, small, and dense.

Four outer planets—Jovian planets—are made of gas and liquid and are large.

Nebular theory of solar system formation says that a cloud of gas and dust gradually

collapsed under its own gravity, spinning faster as it shrank.







Condensation theory says dust grains acted as condensation nuclei, beginning formation

of larger objects.



© 2017 Pearson Education, Inc.



Summary of Chapter 4, cont.









Planets have been discovered in other solar systems.

Most of those discovered so far are large and orbit much closer to the Sun than the large

planets in our solar system do.



© 2017 Pearson Education, Inc.



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