Before hiring her as a school bus driver, the company required a thorough background check to confirm she had no criminal record.

Before extending the job offer, the company conducted a background investigation on the finalist.

Before hiring, the company conducted extensive background investigations on each finalist.

Employers should conduct thorough background checks before hiring new staff.

The reporter used deep background to explain the official's decision without revealing who provided the information.

The astronomer carefully measured the cosmic background radiation to trace the universe's earliest fluctuations.

Measurements of the cosmic microwave background have provided strong evidence for the Big Bang.

Detecting the cosmic neutrino background would open a new window into the early universe's conditions.

To estimate the history of star formation, researchers model how the extragalactic background light, the total accumulated radiation from star formation processes plus a contribution from active galactic nuclei (AGNs), absorbs and redistributes starlight over cosmic time.

Astronomers measured a faint excess in the cosmic infrared background that hints at early star formation.