[DOC] [TLE] What is an astronomical unit? | Space | EarthSky [PAR] Oct 21, 2016 ... Also, mean distances in AU to prominent solar system. ... One astronomical unit = 
the average distance between them. .... Given that an AU is 146 x 10^6 miles, the 
additional distance to the Center of our two bodies would be... [DOC] [TLE] astronomical unit (AU, or au) | unit of measurement | Britannica.com [PAR] AU, or au a unit of length effectively equal to the average, or mean, distance 
between ... is nearly 40 AU gives ready comparisons of the distances of all three 
bodies. ... was needed was an accurate measurement of the distance between 
any two ... Because of these problems and because distances in the solar system 
were... [DOC] [TLE] Astronomical unit - Wikipedia [PAR] The astronomical unit (symbol au, or ua) is a unit of length, roughly the distance 
from Earth to the Sun. However, that distance varies as Earth orbits the Sun, from 
a maximum (aphelion) to a minimum (perihelion) and back again once a year. 
Originally conceived as the average of Earth's aphelion and perihelion, it is ... 
Equivalently, by this definition, one AU is the radius of an unperturbed... [DOC] [TLE] 1 Kepler's Third Law [PAR] G(m1 + m2)] a3 in MKS units where m1 and m2 are the masses of the two bodies. 
... where P is in Earth years, a is in AU and M is the mass of the central object in 
units of ... Q: The Earth orbits the Sun at a distance of 1AU with a period of 1 year. 
12 = 13. ... the gravitational force between Halley's Comet and the Sun at these. [DOC] [TLE] Earth-Sun Distance Measurement Redefined | Astronomical Unit [PAR] Sep 24, 2012 ... "The new definition is much simpler than the old one," says Sergei Klioner of ... 
They utilize the astronomical unit to calculate the motion of bodies in the solar 
system. ... By studying Mars from two separate points on Earth, 17th-century 
Italian ... "The distance between the Earth and the sun, as any physical... [DOC] [TLE] AU is short for Astronomical Unit and defined as: the radius of an ... [PAR] 2. What features do these model planets and asteroids have in common? ... If you 
were to model the distances of these four Solar System bodies in relation to ... 
between Earth, Mars, Vesta, and Ceres, using the approximate scale of 1 AU = 
20... [DOC] [TLE] The Solar System - The Cosmic Distance Scale - NASA [PAR] Jan 29, 2016 ... An AU is simply the average distance between the Earth and the Sun. ... The 
Moon, the closest solar system body to us, is about 400,000 km away from the 
Earth, which means it takes about 2 seconds for radio signal from Earth to ... 
These so-called Scattered Disc Objects or SDO's are among the most... [DOC] [TLE] astronomy - Why is 1 AU the distance between the Sun and the ... [PAR] Feb 4, 2012 ... Why 1 AU is defined as the distance between the Sun and the Earth? .... I think it 
does involve the earth as one of the two involved bodies. [DOC] [TLE] How do you measure the distance between Earth and the Sun ... [PAR] Jan 30, 2016 ... How do astronomers calculate the distance of the Sun from the ... actually 
measure is the distance from the Earth to some other body, ... (More formally, 
these are the two points at which the angular separation between ... Earth-Sun 
distance, a = roughly 150 million km, defined as one Astronomical Unit (AU) [DOC] [TLE] Units for Distance and Size in the Universe | Las Cumbres Observatory [PAR] Astronomers use many of the same units of measurement as other scientists. ... 
An astronomical unit is the average distance between the Earth and the Sun: ... 
its definition is closely related to a method of measuring the distances between 
stars. ... 102 = 100. 103 = 1000. 104 = 10,000. and so on

Question: An astronomical unit is defined as the average distance between these 2 bodies
Answer: Earth & Sun