2009 in science

	… 1999; 2000; 2001; 2002; 2003; 2004; 2005; ; 2006; 2007; 2008; 2009; 2010; 2011; 2012; ; 2013; 2014; 2015; 2016; 2017; 2018; 2019 …;
	Art; Archaeology; Architecture; Literature; Music; Philosophy; Science; +...

The year 2009 involved numerous significant scientific events and discoveries, some of which are listed below. 2009 was designated the International Year of Astronomy by the United Nations.