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The first space rendezvous was accomplished by Gemini 6A and Gemini 7 in 1965.. Records and firsts in spaceflight are broadly divided into crewed and uncrewed categories. Records involving animal spaceflight have also been noted in earlier experimental flights, typically to establish the feasibility of sending humans to outer space.
A number which is a direct multiple of is known as an imaginary number. [1]: Chp 4 A number that is the sum of an imaginary number and a real number is known as a complex number. In certain physical theories, periods of time are multiplied by i {\displaystyle i} in this way.
(Because the total number of ways in which all the subatomic particles in the observable universe can be combined is , [152] [153] a number which, when multiplied by , is approximately , this is also the time required for a quantum-tunnelled and quantum fluctuation-generated Big Bang to produce a new universe identical to our own, assuming that ...
Human presence in outer space began with the first launches of artificial object in the mid 20th century, and has increased to the point where Earth is orbited by a vast number of artificial objects and the far reaches of the Solar System have been visited and explored by a range of space probes.
As of 30 May 2023, 269 people from 21 countries had visited the space station, many of them multiple times. The United States sent 163 people, Russia sent 57, 11 were Japanese, nine were Canadian, five were Italian, four were French, four were German, two from the United Arab Emirates and Saudi Arabia and one each from Belgium, Brazil, Denmark ...
Missions which were intended to reach space but which failed to do so are listed in bold. Missions between 50 miles (80.45 km) and 100 km (62 mi), which satisfy the US Military definition of space(50 Miles), but not the NASA or Internationally recognized Karman Line definition (100 KM) are listed in italics.
After the name, denotes sub-orbital space travellers who have flown into orbit on a subsequent space flight. After the name, denotes space travellers who have flown to the Moon without landing. After the name, denotes space travellers who have walked on the Moon. ‡ After the name, denotes those who died during their first spaceflight. [nb 1] †
N = the number of civilizations in the Milky Way galaxy with which communication might be possible (i.e. which are on the current past light cone); and R ∗ = the average rate of star formation in our Galaxy. f p = the fraction of those stars that have planets. n e = the average number of planets that can potentially support life per star that ...