1. a scientist who studies stars, planets, and other objects in space

Examples

• The astronomer discovered a new planet using a powerful telescope.
• She became an astronomer after being fascinated by the night sky as a child.
• The famous astronomer published research about distant galaxies.
• Ancient astronomers tracked the movement of celestial bodies without modern instruments.
• The astronomer spent hours observing the solar eclipse.
• Many astronomers work at observatories located far from city lights.