Fill in the blank: ________ is a massive ball of gas in outer space that gives off heat, light and other forms of radiation.

Fill in the blank: ________ is any star around which planets revolve.

Fill in the blank: ________ is the third planet from the Sun; the planet on which we live.

Fill in the blank: ________ is the path of an object as it revolves around another object.

Fill in the blank: ________ is a set of statements or principles devised to explain a group of facts or phenomena.

Fill in the blank: ________ is a force that exists between any two objects that have mass.

A small object made of rock or metal that orbits the sun is called a ________.

A body of ice and dust that travels in a long narrow orbit around the sun is called a ________.

The large, empty part of the universe that does not contain any matter is called ________.

A body in outer space that orbits a planet; a natural satellite is called a ________.

The rise and fall of the ocean's surface levels due to the gravitational pull of the sun and moon is called ________.

A type of tide that occurs when the sun, moon, and Earth are in a straight line; alignment and gravity from the moon and the sun pull the water in the same direction is called ________.

Produced when the sun, moon, and Earth align at a 90° angle; the water on Earth is under the least amount of gravitational pull, because the sun's and moon's forces are opposing each other, producing the smallest rise and fall of tidal levels is called ________.