The correct answer is option 4, constellation.

A constellation refers to a group of stars that form a recognizable pattern or shape in the night sky. The Great Bear, also known as Ursa Major, is one such constellation. It is composed of several stars that, when connected by imaginary lines, create the shape of a bear.

Option 1, galaxy, is not correct. A galaxy is a vast collection of stars, planets, gas, and dust, held together by gravity. Galaxies can contain many constellations, including the Great Bear.

Option 2, planet, is also not correct. A planet is a celestial body that orbits a star and does not produce light of its own. The Great Bear is not a planet; it is a constellation composed of stars.

Option 3, star, is also not correct. While the Great Bear does consist of stars, it is not accurate to say that the Great Bear is a star.

Therefore, the correct answer is option 4, constellation.