Miller represents part of western Illinois. It's not the first time the representative has faced backlash over a remark.

The team that flew Thursday will continue to test the Miller-Urey experiment, which involves the production of amino acids - the building blocks of proteins - from basic gases.

The Miller-Urey experiment has become a classic, and is often repeated in school laboratories. The decades since, however, have enabled a better understanding of early earth, including a key finding.

the Miller-Urey experiment, which used a laboratory device that replicated the early Earth to create lightning-like discharges and synthesize the amino acids that gave rise to life.

In the early 1950s, the Miller-Urey experiment showed that an electrical current could produce organic compounds from a best-guess reconstruction of the chemistry in Earth's earliest oceans ...

American chemist Stanley Miller, using original laboratory equipment, recreates the Miller-Urey experiment, which supported the scientific theory that life could emerge from nonliving molecules.

The Miller-Urey experiment, as it is now known, supported the scientific theory of abiogenesis: that life could emerge from nonliving molecules.