Bell Review Question. Name the 8 planets in our solar system. Name the 4 Jovian and the 4 Terrestrial planets. The Sun. The Sun. Earth’s Primary Source of Energy.
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Name the 8 planets in our solar system.
Name the 4 Jovian and the 4 Terrestrial planets.
Earth’s Primary Source of Energy
The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields.
It has a diameter of about 1,392,684 km, about 109 times that of Earth.
The Sun is a magnetically active star. approximately 150 million kilometers or 1 AU, (an AU is Astronomical Unit), though the distance varies as the Earth moves from perihelion in January to aphelion in July.
The Sun lies close to the inner rim of the Milky Way Galaxy. approximately 150 million kilometers or 1 AU, (an AU is Astronomical Unit), though the distance varies as the Earth moves from perihelion in January to aphelion in July.
The surface temperature of the sun is about 5,780 K, which is 5,500 °C or about 9900 °F, while at the core it's something on the order of 15 million °C or 27 million °F.
Radiation is the transfer mechanism by which solar energy reaches our planet.
Approximately 50 percent of the solar energy that strikes the top of the atmosphere reaches Earth’s surface. About 30 percent is reflected back to space. The remaining 20 percent of the energy is absorbed by clouds and the atmosphere’s gases.
Sample albedos surface Low albedo Typical albedo
Fresh asphalt 0.04
Worn asphalt 0.12
Conifer forest 0.15
Bare soil 0.17
Green grass 0.25
Desert sand 0.40
New concrete 0.55
Ocean Ice 0.5–0.7
Fresh snow High albedo 0.80–0.90
Radiant energy that is absorbed heats Earth and eventually is reradiated skyward. Because Earth has a much lower surface temperature than the Sun, its radiation is in the form of long wave infrared radiation.
The atmosphere is heated from the ground up. The general drop in temperature with increased altitude in the troposphere (about 6.5°C/kilometer, a figure called the normal lapse rate) supports this fact.
Through the heating of Earth’s atmosphere by the long wave radiation from the surface and the selective absorption of such radiation; results in what is know as the Greenhouse Effect.
The End and outgoing radiation, called the heat budget, Earth’s average temperature remains relatively constant.