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1. Is gravity always proportional to the mass of the planet/star? Is there any other factor we consider when we determine the gravity of a distant star?

2. Does light bend only if it interacts with the gravity of a huge star, or,

the bend is visible with interaction huge stars, but happens with any small amount of gravity - but unable to detect with the current technology or our maths knowledge.

3. Can there be a possibility of so huge gravity (or mass) and it causes a halo around the star? (and no light comes out of it and we call it black hole, he...he...)

4. If gravity can affect photons, is there a possibility of mass for the photon which is so so negligible? Why do we reject any theory based on that (or, is there a mathematical proof that says photon has to be massless?)