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Interstellar travel is the hypothetical travel of spacecraft between star ... Various shielding methods to mitigate this problem have been proposed. [6] Larger ...
The corresponding problem in interstellar travel is called the wait calculation, which tries to determine the optimal time to wait for technological progress to improve spaceship speeds before committing to the journey.
Intergalactic travel is the hypothetical travel between galaxies. Because the Milky Way and its closest neighbors are separated by millions of light-years, any such venture would also require millions of years based on current physics. Thus, intergalactic travel is impossible within the human lifetime.
An interstellar object between 2 to 50 times the mass of Jupiter passing through the solar system provides a better explanation, the study says. Artist’s depiction of interstellar comet Oumuamua ...
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This is an accepted version of this page This is the latest accepted revision, reviewed on 6 January 2025. Problem of the lack of evidence for alien life despite its apparent likelihood This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between the ...
This creates an observational dilemma since even slower-than-lightspeed interstellar travel could in theory take only 5 to 50 million years to colonize the galaxy. [6] This leads to a conundrum first posed in 1950 by the physicist Enrico Fermi in his namesake paradox: "Why are no aliens or their artifacts physically here?" [7]
A major problem this design would face would be the radiation encountered en route. Travelling at 20% of light speed, ordinary interstellar hydrogen would become a significant radiation hazard, and the Starwisp would be without shielding and likely without active self-repair capability. Another problem would be keeping the acceleration of the ...