Gravity does not specifically interact with electromagnetism. Gravity is an interaction between masses.
The mechanism that creates mass is not yet well understood; it is believed to be caused by a hypothetical (not-quite-confirmed) particle called a "Higg's Boson".
yes because eveything in the universe have gravity
Gravity is the strongest force in the universe. Not because other forces are not more powerful, but because gravity reaches throughout the universe. Volcanoes really have very little effect on gravity.
Stars in the universe twinkle because of refraction not gravity.
Yes. Gravity exists everywhere in the universe as all objects have a gravitational pull. Objects in space do not seem weightless because there is no gravity. Rather they seem weightless because they are in freefall.
Everything that has mass has gravity - so virtually everything in the Universe has gravity.
gravity is a force that pulls us on to the ground and earth makes the gravity.In space there is no gravity (scientist call this zero gravity) so gravity isn't pulling the universe back because there is no gravity outside planets.
Gravity regulates and repairs the universe.
Gravity is a property of mass. No mass, no gravity. But whether mass is just a mathematically curled up scrap of space, is still up for discussion. As you infer, without electromagnetic waves, (of the right frequency) no light.
Gravity affects all of the objects in the universe, but then again, gravity doesn't affect the universe.
Gravitation is the only force that acts universally.
There's gravity everywhere in the universe, including on the Moon. Because of the way gravity works, if you go to the moon, your weight when you're there will be about 16% of what it is on Earth.
Gravity is the major force in the Universe controlling matter. Gravity controls the structure of the Universe.