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The equation says nothing directly about the contact cross-section between an ETIS and contemporary human society". [73] Because it is the contact cross-section that is of interest to the SETI community, many additional factors and modifications of the Drake equation have been proposed. Colonization
First Mars flyby (11,000 km) but contact was lost. USSR Mars 1: 14 December 1962: First planetary flyby with data returned . First successful planetary science mission. USA (NASA) Mariner 2 [13] 16 June 1963: First woman in space (Valentina Tereshkova). USSR Vostok 6: 19 July 1963: First reusable crewed spacecraft (suborbital). USA (NASA) X-15 ...
Canada's fertility rate hit a record low of 1.4 children born per woman in 2020, [32] below the population replacement level, which stands at 2.1 births per woman. In 2020, Canada also experienced the country's lowest number of births in 15 years, [ 32 ] also seeing the largest annual drop in childbirths (−3.6%) in a quarter of a century. [ 32 ]
Pennsylvania (/ ˌ p ɛ n s ɪ l ˈ v eɪ n i ə / ⓘ PEN-sil-VAY-nee-ə, lit. ' Penn's forest country '), officially the Commonwealth of Pennsylvania [b] (Pennsylvania Dutch: Pennsylvanie), [7] is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.
The Northwest Territories (abbreviated NT or NWT; French: Territoires du Nord-Ouest; formerly North-West Territories) is a federal territory of Canada.At a land area of approximately 1,127,711.92 km 2 (435,412.01 sq mi) and a 2021 census population of 41,070, it is the second-largest and the most populous of the three territories in Northern Canada. [3]
In 1986, the first apology for residential schools by any institution in Canada was from the United Church of Canada in Sudbury, Ontario. [104] At the 1986 31st General Council, the United Church of Canada responded to the request of Indigenous peoples that it apologize to them for its part in colonization and adopted the apology. Rev.
Generation Z (often shortened to Gen Z), also known as Zoomers, [1] [2] [3] is the demographic cohort succeeding Millennials and preceding Generation Alpha.Researchers and popular media use the mid-to-late 1990s as starting birth years and the early 2010s as ending birth years, with the generation most frequently being defined as people born from 1997 to 2012. [4]