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'Planet Y' theory hints at hidden Earth-size world lurking in the solar system — and it could be much closer to us than 'Planet Nine'

A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...
Science Daily

Earth’s climate just crossed a line we can’t ignore

Humanity has reached the first Earth system tipping point, the widespread death of warm-water coral reefs, marking the ...