astronomers

Word family

• astronomy
  nounB1
• astronomer
  nounB2
• astronomical
  adjectiveB2
• astronomically
  adverbC1

Synonym discussion

Sense: noun/1

Astronomer is the broadest everyday term for a scientist who studies objects in space. An astrophysicist is a kind of astronomer who applies physics principles (gravity, radiation, nuclear reactions) to understand how stars and galaxies work — the term is more technical and often appears in research papers. A cosmologist focuses on the universe's origin, evolution, and large-scale structure, dealing with concepts like the Big Bang and dark matter. Astrologer looks similar but is completely unrelated: it refers to someone who interprets star signs and horoscopes, a practice not based on science. Space scientist is an even wider term that may include engineers who build rockets and planetary geologists who study soil on Mars. Example: 'The astronomer photographed Jupiter through a telescope, while the astrophysicist calculated the planet's internal temperature. Her cousin, an astrologer, read the same night's horoscope for a newspaper column.'

Common collocations

Etymology

The word astronomer traces back through Latin and French to the Greek word astronomia, a combination of astron (star) and nomos (arranging or law). In ancient Greece, astronomia meant 'the arrangement of the stars' — the practice of mapping and naming constellations. The word entered English from French astronome during the 14th century, referring to someone skilled in the science of the heavens.