The solar system is made up of the sun, 8 planets, more than 100 satellites, numerous dwarf planets and countless asteroids, comets and meteoroids.
The order of the planets from inside to outside is: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Mercury, Venus, Earth and Mars close to the sun are called terrestrial planets.
Their common characteristics are high density (>3.0 g/cm3), small size, slow rotation, few satellites, internal components mainly composed of silicate (silicate), and an outer shell solid. Jupiter, Saturn, Uranus and Neptune which are far from the sun are called Jovian planets.
Their common characteristics are low density (<2.0 g/cm3), large volume, rapid rotation and more satellites. According to spacecraft detection data, they all have very thick atmospheres and have solid cores ifmilaries to those of the telluric planets.
Detailed information
There is an asteroid belt between Mars and Jupiter, which contains hundreds of thousands of asteroids (i.e. i.e. made up of rocks) composed of small irregular elements. stars). It is assumed that these are fragments of rocks located between Mars and Jupiter that have not yet accumulated into planets.
Meteoroids exist between planets and are composed of stone or iron. The meteorites presented in the chapter on earthquakes and the internal structure of the earth are fragments of meteorites that fell to the earth.
In a ring from the orbit of Neptune to 40 to 50 astronomical units from the sun, there is a “warehouse” of comets, estimated at 100 to 1,000 billion comets, called the Kuiber belt . Comets are mainly composed of ice like water, carbon dioxide, carbon monoxide, ammoniac and methane, mixed with dust particles, and generally measure from a few hundred to several tens of meters.
Comets orbiting the sun in the Kuiper Belt sometimes change orbit due to the gravitational influence of other celestial bodies and fly into the inner solar system along an elliptical orbit lying down. When they approach the sun, they are heated by sunlight, and gases and dust evaporate from the comet body, forming a comet tail under the action of the solar wind and sunlight. sun.
Baidu Encyclopedia - Solar System
1. Small power generation equipment
(1) Small power supply ranging from 10 to 100 W., used for electricity for military and civilian life in remote areas without electricity, such as plateaus, islands, pastoral areas, border posts, etc., such as lighting, televisions,radio cassette players, etc. ;
(2) 3-5KW household rooftop grid-connected power generation system;
(3) Photovoltaic water pump: solves the problem of deep water consumption and irrigation in areas without electricity.
2. Transportation fields such as navigation lights, highway/railroad signal lights, warning lights/traffic signals, Yuxiang street lights, high-altitude obstacle lights, highway/railway wireless telephone booths, shift power supply unsupervised road, etc.
3. Communication/communication field: unattended solar microwave relay station, optical cable maintenance station, broadcast/communication/messaging power supply system; rural operator telephone photovoltaic system, small communication machine, soldier GPS power supply, etc. .
4. Oil fields, marines and weather: cathodic protection solar power systems for oil pipelines and reservoir valves, standby and emergency power supplies for oil drilling platforms, ocean sensing equipment, weather/hydrological observation equipment , etc. .
5. Power supply for home lighting: such as garden lights, street lights, portable lights, camping lights, climbing lights, fishing lights, black light lights, rubber tapping lights, energy saving lamps, etc.
6. Photovoltaic power plants: independent photovoltaic power plants from 10KW to 50MW, wind and solar (diesel) complementary power plants, various charging stations for large parking power plants, etc. 7. Solar buildings combine solar power generation with building materials to enable large-scale buildingsto be self-sufficient in electricity, which constitutes a major development direction for the future.
8. Other fields include: (1) Automotive support: solar cars/electric cars, battery charging equipment, car air conditioners, fans, cold drink boxes, etc. (2) Solar hydrogen regeneration; generation and fuel cells Power generation system; (3) Power supply for seawater desalination equipment (4) Satellites, spacecraft, space solar power plants, etc.