The discovery marks a clear advance in understanding the basic biology of the virus, knowledge that may open up new approaches to research and treatment.

The discovery marked the beginning of X-ray astronomy, which soon became a principal tool of astrophysical research.

The discovery marked the start of the resource boom in Western Australia in the 1970s.

The discovery marks an important achievement for Curiosity, and supports the notion that Mars was once capable of harboring life.

The discovery of her belly button at a year and a half had marked the start of a new relationship, one of pleasure and comfort.

This discovery marked the beginning of the modern age of cosmology.

The discovery marks the LHC's first clear observation of a new particle since it became operational in 2009.

Jansky's discovery in 1932 marked the first successful observation in radio astronomy.

The discovery marks the next important milestone in the ultimate search for planets like Earth.

This discovery marked the beginning of a period of drastic change for the people of Western Pennsylvania.