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Scientists scour the Earth and the sky for clues to our planet's climate history. Powerful and sustained volcanic eruptions can alter the climate for long periods of time, and the Sun's output can shift Earth's climate over millions of years.
"Stars move, and now this paper is showing not only that they move, but they encounter drastic changes." – Merav Opher, Professor of Astronomy, BU College of Arts & Sciences However, the denser clouds in the ISM are dense enough to dramatically affect the protective heliosphere. "We have assumed here that these clouds have not undergone any substantial change over the last 2~Myr, though future work may provide more insight into their evolution."
Previous research linked the 60Fe to a supernova explosion, where it became entrenched in dust grains and then delivered to Earth. It's also present on the Moon. 244Pu was delivered at the same time, also in supernovae ejecta. "A close supernova explosion contradicts the recent model of the Local Bubble formation," the authors explain."The scenario does not require the absorption of 60Fe and 244Pu into dust particles that deliver them specifically to Earth, like the scenario with nearby supernova explosions."An in-depth study of the consequences is outside the scope of this research.
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