Rocky fireballs like the one that fell over Alberta, Canada last year shouldn't originate from the icy Oort Cloud... but this one apparently did.
A dazzling fireball that ended its cosmic journey over central Alberta, Canada could change astronomers' understanding of how the solar system formed 4.5 billion years ago.
According to NASA, the Oort Cloud is thought to have formed when gravity from the newly formed planets pushed icy objects away from the sun. Gravity from the Milky Way galaxy caused the objects to settle on the edge of the solar system instead. Rather, these results support what's known as the"Grand Tack" theory of solar system formation. This model proposes that Jupiter formed closer to the sun and migrated towards it before gravitational effects between Jupiter and Saturn forced both planets farther out. Only this model can account for sufficient amounts of rocky material from the inner solar system being ejected to the Oort cloud to explain the fireball, according to the researchers.
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