Description
Size:
The planet Earth is a relatively small planet for our solar system with a
mass of 5.9736×1024 kg and a diameter of 12,756.3 km.
Orbital Characteristics:
The planet Earth obits the Sun at an average speed of 29.78 km/s. At this speed
it takes this planet 365.2 days to complete its revolution around the Sun. A
day on Earth lasts 24 hours.
Brightness:
Earth is a relatively bright planet for the solar system with a
visual magnitude of -3.86 V(1,0) and an irradiance of 1367.6 W/m2.
Atmosphere:
Earth has a relatively thick atmosphere with an average density
of 5,515 kg/m3 and a mean pressure
of 1014 mb. It's atmosphere is composed of
the elements 78.084% Nitrogen (N2), 20.946% Oxygen (O2), and other trace elements.
The mean temperature of Earth is 15 degrees Celsius.
Moons:
Earth has 1 moon. It is usually simply called "the Moon"
but it is sometimes referred to by its Latin name "Luna".
This name is the derivative of the word "Lunar" - as in "Lunar
Orbit".
