Gravity
GRAVITY!
An island comprising billions of stars and nebulae, held together by gravity.
Gravity holds the planet together as a 'ball' and you on it. It also makes things fall. We can measure this so we know the force of gravity on earth and can calculate it for other planets and stars.
Gravity - from the stars, dust, etc., but especially from "dark matter", a substance of yet unknown composition.
the gravitational force holds its atmosphere together
No, there are not moons or stars ON planet earth, but there are moons and stars around planet earth. == ==
Gravity is the force that holds matter in a nebula together. As the nebula contracts under its own gravity, the particles begin to clump together, eventually forming stars and other celestial bodies.
None. No planet or dwarf planet contains stars.
It is gravity.
Gravity keeps the planets in orbit around the sun and the stars and the stars in orbit around the center of the galaxy. Gravity also holds the stars together against their own internal pressure.
I am not sure that it makes sense to say that anything holds the Earth. The Earth is a planet in space, which orbits the sun. Gravity holds it in orbit, and gravity holds it together. The incompressible matter of which it is composed, holds up the surface, for our convenience as its inhabitants. Every layer, the inner core, the outer core, the mantle, and the crust, has a role to play in making our planet what it is.
Gravity plays a crucial role in galaxy formation and evolution. It acts as the force that pulls gas and dust together to form stars and holds together the structures of galaxies. Gravity also influences the motion of stars and other celestial bodies within a galaxy, shaping its overall structure and dynamics.