Question

1. which of the following disqualifies a celestial object from being considered a star?

stars are fueled by nuclear fusion.
stars have a fixed path or orbit.
stars are gaseous and massive.
stars release energy in the form of electromagnetic radiation.

Explanation:

Stars are fueled by nuclear fusion (hydrogen - helium fusion in main - sequence stars), they are gaseous (mostly hydrogen and helium) and massive (sufficient mass to sustain nuclear reactions), and they release energy in the form of electromagnetic radiation (light, heat etc.). Planets (not stars) have a fixed path or orbit around a star.

Answer:

Stars have a fixed path or orbit.