Push and pull: Dark energy discovery changed understanding of universe, says Nobel laureate Brian Schmidt

Brian Schmidt, along with Adam Riess and Saul Perlmutter, discovered dark energy in 1998, revealing that the universe's expansion is accelerating. Dark energy, unlike dark matter, pushes the universe apart and has won the 'war' against gravity. Schmidt also leads the SkyMapper Telescope Project, studying the universe's earliest stars to understand its initial chemistry.