Inner planets | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-29

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Solar_System


00:03:03 1 Discovery and exploration
00:04:40 2 Structure and composition
00:09:38 2.1 Distances and scales
00:12:26 3 Formation and evolution
00:17:01 4 Sun
00:18:37 5 Interplanetary medium
00:20:58 6 Inner Solar System
00:21:34 6.1 Inner planets
00:22:23 6.1.1 Mercury
00:23:16 6.1.2 Venus
00:24:14 6.1.3 Earth
00:24:56 6.1.4 Mars
00:25:47 6.2 Asteroid belt
00:26:57 6.2.1 Ceres
00:27:38 6.2.2 Asteroid groups
00:28:42 7 Outer Solar System
00:29:17 7.1 Outer planets
00:30:11 7.1.1 Jupiter
00:30:56 7.1.2 Saturn
00:31:50 7.1.3 Uranus
00:32:26 7.1.4 Neptune
00:33:07 7.2 Centaurs
00:33:47 8 Comets
00:35:00 9 Trans-Neptunian region
00:35:52 9.1 Kuiper belt
00:37:32 9.1.1 Pluto and Charon
00:38:43 9.1.2 Makemake and Haumea
00:39:41 9.2 Scattered disc
00:40:41 9.2.1 Eris
00:41:23 10 Farthest regions
00:42:05 10.1 Heliosphere
00:44:25 10.2 Detached objects
00:46:01 10.3 Oort cloud
00:46:50 10.4 Boundaries
00:47:50 11 Galactic context
00:50:01 11.1 Neighbourhood
00:52:25 11.2 Comparison with extrasolar systems
00:53:43 12 Visual summary
00:54:08 13 See also



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- Socrates


SUMMARY
=======
The Solar System is the gravitationally bound planetary system of the Sun and the objects that orbit it, either directly or indirectly. Of the objects that orbit the Sun directly, the largest are the eight planets, with the remainder being smaller objects, such as the five dwarf planets and small Solar System bodies. Of the objects that orbit the Sun indirectly—the moons—two are larger than the smallest planet, Mercury.The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in the Sun, with the majority of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane. All eight planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.
The Solar System also contains smaller objects. The asteroid belt, which lies between the orbits of Mars and Jupiter, mostly contains objects composed, like the terrestrial planets, of rock and metal. Beyond Neptune's orbit lie the Kuiper belt and scattered disc, which are populations of trans-Neptunian objects composed mostly of ices, and beyond them a newly discovered population of sednoids. Within these populations are several dozen to possibly tens of thousands of objects large enough that they have been rounded by their own gravity. Such objects are categorized as dwarf planets. Identified dwarf planets include the asteroid Ceres and the trans-Neptunian objects Pluto and Eris. In addition to these two regions, various other small-body populations, including comets, centaurs and interplanetary dust clouds, freely travel between regions. Six of the planets, at least four of the dwarf planets, and many of the smaller bodies are orbited by natural satellites, usually termed "moons" after the Moon. Each of the outer planets is encircled by planetary rings of dust and other small objects.
The solar wind, a stream of charged particles flowing outwards from the Sun, creates a bubble-like region in the interstellar medium known as the heliosphere. The heliopause is the point at which pressure from the solar wind is equal to the opposing pressur ...