스타더스트(Stardust)는 잊어라 – 그것은 모두 스타아이스(Star-Ice)였다

Carl Sagan famously said that “We’re all made of star-stuff”. But he didn’t elaborate on how that actually happened. Yes, many of the molecules in our bodies could only have been created in massive supernovae explosions – hence the saying. Scientists have long thought they had the mechanism for how settled – the isotopes created in the supernovae flew here on tiny dust grains (stardust) that eventually accreted into Earth, and later into biological systems. However, a new paper from Martin Bizzarro and his co-authors at the University of Copenhagen upends that theory by showing that much of the material created in supernovae is captured in ice as it travels the interstellar medium. It also suggests that the Earth itself formed through the Pebble Accretion model rather than massive protoplanets slamming together.