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Earth mass is a unit of mass equal to the mass of the planet Earth, which is about 5.9722 × 1024 kg. The web page explains how the Earth mass is measured indirectly by determining Earth's density, gravity, or gravitational constant, and what elements make up the Earth's core, mantle and crust.
The choice of solar mass, M ☉, as the basic unit for planetary mass comes directly from the calculations used to determine planetary mass.In the most precise case, that of the Earth itself, the mass is known in terms of solar masses to twelve significant figures: the same mass, in terms of kilograms or other Earth-based units, is only known to five significant figures, which is less than a ...
Volume of planet Venus: 1 × 10 21: One yottalitre: 1.08 × 10 21: Volume of planet Earth: 2.25 × 10 21: Volume of all the rocky planets in the Solar System: 6.38 × 10 22: Volume of planet Neptune: 7.02 × 10 22: Volume of planet Uranus: 9.23 × 10 23: Volume of planet Saturn: 1 × 10 24: One ronnalitre: 1.53 × 10 24: Volume of planet ...
Learn about the system of measurement developed for use in astronomy, including the astronomical unit of length, mass and time. The astronomical unit of length is defined as exactly 149 597 870 700 meters, approximately equal to the mean Earth–Sun distance.
Earth is the third planet from the Sun and the only one with life. It has a global ocean, a dynamic atmosphere, a liquid core, and a varied surface with mountains, volcanoes, and landmasses.
Learn about the different units of volume and capacity used to measure the extent of an object or space in three dimensions. Compare the SI unit of volume, the cubic metre, with other units such as litre, barrel, gallon, and cubic inch.
A light-year is a unit of length equal to the distance that light travels in a vacuum in one Julian year. Learn how to convert light-years to other units, such as miles, and how the term was coined and used in astronomy.
In astrodynamics, canonical units are defined in terms of some important object’s orbit that serves as a reference. In this system, a reference mass, for example the Sun’s, is designated as 1 “canonical mass unit” and the mean distance from the orbiting object to the reference object is considered the “canonical distance unit”.