Common words:
* Astronomy: The study of celestial objects and phenomena.
* Astrology: The study of the supposed influence of celestial objects on human affairs.
* Astronaut: A person trained to travel in space.
* Asteroid: A small rocky body orbiting the sun.
* Astrophysics: The branch of physics dealing with celestial objects and phenomena.
Less common words:
* Asterism: A recognizable pattern of stars.
* Astrobleme: A scar on Earth's surface caused by an asteroid impact.
* Astral: Relating to the stars or the heavens.
* Astrolabe: An ancient instrument used to measure the position of stars.
Other interesting words:
* Disaster: Originally meaning "ill-starred" or "unlucky," this word has evolved to refer to a catastrophe.
* Astrological: Relating to astrology.
* Astrophotography: The photography of celestial objects.
This is not an exhaustive list, but it gives you a good idea of the range of words that use the root "astr."