Simplify the following text for a Grade 6 native English-speaking person.
Original: The most likely ultimate fate of the planet is absorption by the Sun in about 7.5 billion years , after the star has entered the red giant phase and expanded to cross the planet 's orbit .
Simplified: The most likely fate of the planet is being destroyed by the Sun in about 7.5 billion years , after the star has entered the red giant phase and expanded to cross the planet 's orbit .