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[https://en.wikipedia.org/wiki/Mass Mass] is a property of physical objects that determines the strength of an object's [[Gravity|gravitational force]] on other objects. The mass of an object also determines how it will respond when an external force is applied (such as a collision, or the gravitational pull of a nearby object). ==Property Details== ===Location=== The Mass property of an object can be found near the top of the [[Overview Tab|Overview]] tab in the property panel, just under the object's name. If the object has a [[Composition Tab|Composition]] tab, the Mass will also be listed under the Cumulative Properties category in that tab. For a [[Galaxy Nebula]] object, the Mass is located near the top of the [[Nebula Tab|Nebula]] tab. The Mass of an object is also displayed in its mini-info panel. ===Units=== Mass can be viewed and edited using the following units: * Milky Way Galaxy mass (milky way) = 1.5Γ10<sup>12</sup> sun * Solar mass (sun) = 1.9891Γ10<sup>30</sup> kg * Jupiter mass (jupiter) = 1.8986Γ10<sup>27</sup> kg * Earth mass (earth) = 5.97219Γ10<sup>24</sup> kg * Moon mass (moon) = 7.349Γ10<sup>22</sup> kg * Earth ocean mass (ocean) = 1.4Γ10<sup>21</sup> kg * Earth atmosphere mass (atmosphere) = 5.158Γ10<sup>18</sup> kg * Kilogram (kg) is the [https://en.wikipedia.org/wiki/International_System_of_Units SI] base unit for mass * Gram (g) = 1Γ10<sup>-3</sup> kg * Milligram (mg) = 1Γ10<sup>-6</sup> kg ==Simulation Effects== ===Gravity=== The mass, ''M'', of an object determines the [[Gravity|gravitational force]] that the object exerts on other objects in the simulation, as well as the force that will be exerted on it. If two object have masses ''M''<sub>1</sub> and ''M''<sub>2</sub>, the distance between the objects is ''d'', and the [[Gravitational Constant|gravitational constant]] of the simulationis ''G'', then the gravitational force between the objects is :<math>F = G\frac{M_1 M_2}{d^2}. </math> ===Collisions=== The mass of an object will determine the outcome of a [[collision]] with another object, including the resulting velocities due to [[Momentum Conservation|momentum conservation]], the [[Fragmentation|production of fragments]], and the amount of [[Collision Heating|heat]] produced by the collision. ===Radius and Density=== Objects in Universe Sandbox are simulated as spheres of uniform density, so the mass of an object, ''M'', is related to its [[radius]], ''R'', and [[density]], Ο, by :<math>M = \frac{4}{3}\pi R^3 \rho.</math> [[Category:Physics]]
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