The force that causes objects with mass to attract one another.

• gravity
• orbital path
• system
• outer planet

Objects such as planets, moons, and stars that are located in the sky or in space.

• solar systems
• comas
• asteroid belts
• celestial objects

The gravitationally-curved path of an object around a point in space.

• solar system
• coma
• terrestrial
• orbital path

The luminous celestial body around which Earth and other planets revolve and from which they receive heat and light.

• star
• planet
• moon
• sun

A ball of gas in space that produces its own light and heat.

• planet
• meteorite
• star
• asteroid belt

Any of the large celestial bodies that revolve around the Sun in the solar system

• solar systems
• planets
• asteroids
• meteorites

Any of the rocky, terrestrial planets of Mercury, Venus, Earth, and Mars, whose orbits are inside the asteroid belt.

• outer planets
• inner planets
• Galilean moons
• asteroids

Any of the planets Jupiter, Saturn, Uranus, and Neptune, whose orbits lie beyond the asteroid belt.

• inner planets
• outer planets
• solar systems
• Galilean moons

The sun together with the group of planets and other celestial bodies that are held by its gravitational attraction and revolve around it.

• inner planets
• outer planets
• solar system
• Galilean moons

A group of interacting or interdependent parts forming a complex whole; for example, all the factors or variables in an environment or all the planetary bodies revolving around a star.

• system
• coma
• asteroid
• terrestrial