Planetary systems | Wikipedia audio article
Channel: wikipedia tts
Date: 29/05/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Planetary_system


00:01:14 1 History
00:01:24 1.1 Heliocentrism
00:02:18 1.2 Discovery of the Solar System
00:02:59 1.3 Speculation on extrasolar planetary systems
00:04:17 1.4 Detection of exoplanets
00:05:09 2 Origin and evolution
00:05:40 2.1 Evolved systems
00:05:49 2.1.1 High-mass stars
00:07:05 2.1.2 Lower-mass stars
00:08:43 3 System architectures
00:09:44 3.1 Components
00:09:53 3.1.1 Planets
00:16:37 3.1.2 Circumstellar disks and dust structures
00:17:51 3.1.3 Comets
00:18:57 3.1.4 Other components
00:20:04 3.2 Orbital configurations
00:20:29 3.2.1 Mutual inclination
00:21:18 3.2.2 Orbital dynamics
00:23:34 3.2.3 Number of planets, relative parameters and spacings
00:24:53 3.2.4 Planet capture
00:26:21 4 Zones
00:26:31 4.1 Habitable zone
00:27:50 4.2 Venus zone
00:28:49 5 Galactic distribution of planets
00:32:27 6 See also



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SUMMARY
=======
A planetary system is a set of gravitationally bound non-stellar objects in or out of 
orbit around a star or star system. Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals and circumstellar disks. The Sun together with its planetary system, which includes Earth, is known as the Solar System. The term exoplanetary system is sometimes used in reference to other planetary systems.
As of 1 May 2019, there are 4,058 confirmed planets in 3,033 systems, with 658 systems having more than one planet. Debris disks are also known to be common, though other objects are more difficult to observe.
Of particular interest to astrobiology is the habitable zone of planetary systems where planets could have surface liquid water, and thus the capacity to harbor Earth-like life.