Navigating through the Stars

4. A half of the Earth which is usually divided by the equator.
5. The great circle on the celestial sphere representing the sun's apparent path during the year.
6. The brightest star in the constellation of Orion.
8. Also known as Alpha Ursae Minoris and is the brightest star found in the night sky.
9. A prominent constellation located on the celestial equator and visible throughout the world. It is one of the most recognizable constellations in the night sky.
11. A type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

1. In astronomy and navigation, the ________ sphere is an abstract sphere with an arbitrarily large radius concentric to Earth.
2. A group of stars that make an imaginary shape in the night sky.
3. A pattern of the stars that are part of an official constellation or composed of stars belonging to different constellations.
7. The big ______ is also known as "The Plough" and is an asterism that consists of seven bright stars of the constellation Ursa Major.
10. A cardinal direction found in your compass.