Abstract
It is still generally assumed that interstellar travel will be possible after purely technical development and thus that mankind can move to some suitable exoplanet when needed. However, recent research indicates this not to be the case, since interstellar space is filled with enough ultradense hydrogen H(0) as stable condensed dark matter (Holmlid, Astrophysical Journal 2018) to make interstellar space travel at the required and technically feasible relativistic velocities (Holmlid et al, Acta Astronautica 2020) almost impossible. H(0) can be observed to exist in space from the so-called extended red emission (ERE) features observed in space. A recent review (Holmlid et al., Physica Scripta 2019) describes the properties of H(0). H(0) gives nuclear processes emitting kaons and other particles, with kinetic energies even above 100 MeV after induction for example by fast particle (spaceship) impact. These high particle energies give radiative temperatures of 12000 K in collisions against a solid surface and will rapidly destroy any spaceship structure moving into the H(0) clouds at relativistic velocity. The importance of preserving our ecosystem is pointed out, since travel to suitable exoplanets may be impossible. The possibilities of instead clearing interstellar space from H(0) are discussed, eventually providing tunnels suitable for relativistic interstellar transport. Finding regions with low intensity of ERE could even be a way to identify space-cleaning activities and thus to locate earlier space-travelling civilizations.
Highlights
The focus of this contribution is on one aspect which is normally not seriously included in the discussions of future space probes and space travel, namely, that interstellar travel is not possible not even in principle or after considerable technical development
The reason why interstellar travel is difficult is that space is not as empty as it may seem from a casual look but is filled with enough dark matter [3] in the form of condensed ultradense hydrogen H(0) to make interstellar space travel at the required relativistic velocities almost impossible
Other arguments based on nuclear synthesis in the Big Bang fall in the same trap: it is assumed that the correct atomic amounts in space can be observed by spectroscopy without taking into account that space is filled with condensed matter like ultradense hydrogen and ordinary Rydberg Matter [12]
Summary
The focus of this contribution is on one aspect which is normally not seriously included in the discussions of future space probes and space travel, namely, that interstellar travel is not possible not even in principle or after considerable technical development. The facile interconversion between D(1) and D(0) was observed experimentally in real time [33] This means that the stable state H(0) is reached by hydrogen in space at large enough densities or low enough temperatures >100 MeV This means that X-ray and gamma photons are formed as secondary particles by the interaction of the fast, charged muons and mesons with matter. Low intensities of neutrons are formed by muon capture and muon catalyzed fusion [27, 46]
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