The 'Two bodies' application consists of two modules:
1-Two bodies
2-Solar system - Galactic core.

Two bodies - Simulates the movement of two generic bodies subject to mutual gravitational attraction. The characteristics of the two bodies can be changed. The examples shown refer to:
To the motion of the earth around the sun
At the motion of the moon around the earth.

Solar system - Galactic nucleus - It is a further example of two bodies in which the movement of the solar system is studied around the central nucleus of the galaxy (the milky way) in which the major part of the mass is thickened generating the black hole of the galaxy.