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Greenhouse effect

The natural effect that a planet’s atmosphere has on reducing the amount of radiation emitted into space, resulting in a planet warmer than it would be without an atmosphere.

Greenhouse effect (enhanced)

The reduction in radiation emitted into space from Earth due to an increasing concentration of greenhouse gases in the atmosphere (especially carbon dioxide) caused by human activities; believed by most scientists to be the cause of global warming.

Solar System

The Sun and all the objects that orbit around it.
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Luminosity and apparent brightness of the Sun: the solar constant

Luminosity

the power emitted by a celestial body (across all wavelengths) is called its luminosity. The Stefan–Boltzman law can be restated with respect to stars as:
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Chemistry note topic 4: bondingEuclid Geometry