I am an astronomer.
I'm studying to become an astronomer.
Traditionally, an astronomer directly observed the stars, but nowadays some astronomers instead use data automatically generated by properly programmed telescopes or satellites.
The astronomer studied distant galaxies using a powerful telescope.
The astronomical star looked like it could be a planet because of its enormous size.
Carl Sagan was a noted astronomer.
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The astronomer's observations proved that cephid variable stars would pulsate in a regular cycle
The astronomer looked through the telescope's eyepiece to observe the stars.