Four-and-a-half billion years ago, a massive world—possibly as big as the moon or even Mars—orbited our sun before crashing into another celestial body and shattering into rubble. Now, in a paper published in the journal Earth and Planetary Science Letters,

A viral video of a meteor darting past an erupting Philippine volcano sent the internet into an alien frenzy after an unknown object was seen rising from the earth after impact — but a renowned scientist says there’s a perfectly logical explanation.