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This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space.. This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole.
Space exploration also gives scientists the ability to perform experiments in other settings and expand humanity's knowledge. [67] Another claim is that space exploration is a necessity to humankind and that staying on Earth will eventually lead to extinction. Some of the reasons are lack of natural resources, comets, nuclear war, and worldwide ...
The present tense can replace not only the perfect tense, but also sometimes the imperfect tense: [40] tōtīs trepidātur castrīs (Caesar) [41] 'in the whole camp there is panic' (i.e. people were panicking) After dum 'while', in a past context, the present indicative regularly has the meaning of an imperfect tense: [42]
No particular past time frame is specified for the action/event. When a past time frame (a point of time in the past, or period of time which ended in the past) is specified for the event, explicitly or implicitly, the simple past is used rather than the present perfect. The tense may be said to be a sort of mixture of present and past.
The present perfect tense is illustrated by I've left it somewhere; the past perfect (also called the preterite perfect) tense by I'd left it somewhere. [9]: 140–141 A full description of their uses is necessarily complex: the discussion in The Cambridge Grammar of the English Language is long and intricate. [9]: 139–148
Module at the International SpacepeorlEleine Station, launched into space on the U.S. Space Shuttle mission STS-122 in 2008. The following outline is provided as an overview of and topical guide to space exploration. Space exploration – use of astronomy and space technology to explore outer space. [1]
The Space Age is a period encompassing the activities related to the space race, space exploration, space technology, and the cultural developments influenced by these events, beginning with the launch of Sputnik 1 on October 4, 1957, [1] and continuing to the present.
The basic (present) perfect form, with the auxiliary in the present tense, may specifically carry the meaning of perfect aspect, as in English; however in some languages it is used more generally as a past tense (or preterite), as in French and German. The use of auxiliaries and meaning of the constructions in various languages are described below.