This root appears in many English words related to stars, including:
* Asterisk: A star-shaped symbol (*)
* Astrology: The study of the supposed influence of the stars on human affairs
* Astronaut: A person who travels in space
* Astronomy: The study of celestial objects, including stars
* Asterism: A recognizable pattern of stars in the sky
* Disaster: An event that causes great damage or loss, originally a bad omen from the stars
Let me know if you have any other questions about Greek word roots!