Answer:
Yes, the student's claim is supported by the evidence.
There are different other forces acting on the planet but with insignificant values.
Step-by-step explanation:
The student claimed that the gravitational force is the only measurable external force acting directly on the planet from the star and it has been proven experimentally. However, there are different other external forces acting on the planet and these forces have insignificant values and have not been supported by any experimental data.