Stars and the Solar System

Definition: a system of objects that revolve around a star.

What causes the cycle of day and night?

Star or planet: makes its own light and is mostly made of hydrogen and helium.

Definition: the orbiting of an object around another object

Definition: massive ball of gas in space that emits heat, light, and other forms of radiation

Definition: body in space that orbits the sun; like a small planet but without the proper mass

Inner or outer planets: made of gases and greater than 40,000 km in diameter.

Definition: a large circular mass that revolves around a star

What is one instrument that people use to study space?

What is wrong with many models of the solar system?

Inner or outer planets: two or fewer moons.

Definition: the spinning of a celestial body, such as a planet, around an axis

Inner or outer planets: more than 10 moons each.

Inner or outer planets: rocky and less than 15,000 km in diameter.

Definition: a small object made of rock or metal that orbits the sun

What is the difference between stars and suns?

Definition: any star around which planets revolve

Definition: a body in outer space that orbits a planet; a natural satellite.

Definition: the circular path of an object as it revolves around another object

Star or planet: reflects light; made of solids, liquids, or gases.