The lexis and structures on the vocabulary of astronomy.
Some of the words used include universe, orbits, planets, eclipse, cosmonaut, satellite, galaxies, etc.
Astronomy: the Scientific study of the universe, especially of the motions, positions, sizes, composition, and behaviour of astronomical objects.
Universe: the totality of all matter and energy that exists in the vastness of space, whether known to human beings or not.
Planet: an astronomical object that orbits a star and does not shine with its own light, especially one of those orbiting the sun in the solar system.
Stars: an astronomical object usually visible as a small bright point of light in the sky.
Orbit: a single revolution an astronomical object around a larger astronomical object.
Cosmonaut: an astronaut in the space programmes of Russia and the formal Soviet Union.
Galaxies: a group of billions of stars and their planets, gas and dust that extends over many thousands of light-years and forms a unit within the universe.
Eclipse: the partial or complete hiding from view of an astronomical object, e.g. the Sun or Moon, when another astronomical object comes between it and the observer.
Astronaut: someone trained to travel and perform tasks in space.
Gravity: the attraction due to gravitation that the Earth or another astronomical object exerts on an object on or near its surface.