Simplify the following text for a Grade 12 native English-speaking person.
Original: The future of the Earth will be determined by a variety of factors , including increases in the luminosity of the Sun , loss of heat energy from the Earth 's core , perturbations by the other bodies in the Solar System and the biochemistry at the Earth 's surface .
Simplified: The future of the Earth will depend on many things , including increases in the brightness of the Sun , loss of heat energy from the Earth 's core and change of the planet 's orbit by the other things in the Solar System .