天文学者らは、太陽が約40億〜60億年前に、天の川銀河の内側領域から類似星の大規模移動に参加した可能性を示す証拠を発見した。この移動は、太陽系を銀河のより穏やかな部分へ運んだ可能性が高い。この発見は、欧州宇宙機関のガイア衛星のデータを使った太陽双子星の詳細研究によるものである。
天文学者らは、太陽が約40億〜60億年前に、天の川銀河の混雑した中心部から太陽類似星の大量外向き移動に加わった兆候を特定した。約46億年前に形成された太陽は、現在位置よりも銀河中心に1万光年以上近い場所で誕生したものだ。
An international team of astronomers has determined that the Milky Way's star-forming disk ends around 35,000 to 40,000 light-years from the galactic center. Using stellar age mapping, they found a U-shaped pattern where star formation drops sharply beyond this boundary. Stars farther out are mostly older migrants drifting from inner regions.
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Astronomers have discovered that the Milky Way resides within a vast, flat sheet of matter dominated by dark matter, surrounded by enormous empty voids. This structure explains why most nearby galaxies are moving away from our Local Group rather than being drawn in by gravity. The finding, based on advanced simulations, resolves a longstanding puzzle in cosmology.
Researchers have pinpointed why planets orbiting two stars, like Tatooine in Star Wars, are rarer than expected. Einstein's general theory of relativity causes orbital instabilities that eject or destroy most such planets around tight binary stars. Only 14 confirmed circumbinary exoplanets exist among over 6,000 discovered.
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Researchers have uncovered evidence of a powerful solar proton event that struck Earth around 1200 ce by analyzing carbon-14 spikes in ancient Japanese trees and cross-referencing medieval records of red auroras.