noun
tidal hypothesis; near-collision hypothesis
Astronomy term for a historical hypothesis about the origin of the solar system, proposing that a close encounter or near-collision with another star pulled material from the sun to form planets. Now largely superseded by the nebular hypothesis.
遭遇説は、太陽系の起源に関する古い仮説の一つです。
The tidal hypothesis is one of the old hypotheses about the origin of the solar system.
現在では、遭遇説よりも星雲説の方が広く受け入れられています。
Nowadays, the nebular hypothesis is more widely accepted than the near-collision hypothesis.
Compound of 遭遇 (そうぐう, 'encounter') and 説 (せつ, 'theory'), referring to the hypothesis that a stellar encounter formed the solar system.