A planet.
A planet
it keeps it in orbit
Planets orbit stars.
Galaxy
Double stars, also called binary stars, are valuable to astronomers because they are the only stars of which astronomers can easily calculate their mass. They are bound to each other by gravity and orbit about a common center. The time it takes for one star to orbit the other depends on the distance between the two stars and their masses.
A planet
Because stars have a greater amount of gravity
Moons orbit planets. Planets orbit stars. Some stars orbit other stars, or orbit their mutual center of gravity. Stars orbit the center of the galaxy. Galaxies may orbit the center of the "galactic group".
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.
They orbit as stars would in any other halo. It is gravity that causes everything to orbit and "spin around" Stars can also orbit around other stars called a binary orbit.
Plants don't orbit anything - planets do.
Gravity.
it keeps it in orbit
stars are formed when particles of matter in space attract to each other beacause of gravity and form clumps slowy increasing their mass and gravity and attracting more particles eventually forming stars many stars orbiting or clustered around a mass large enough to have a great amount of gravity is a galaxy. these large masses are usually thought to be black holes. usually many galaxies orbit around a laarge black hole
The stars are said to be a "gravitational binary pair"
because the stars gravity pulls them in and holds them in orbit
That's called a double star.