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Scientists predict the hole in the ozone layer will close in the next 50 years
In 1987, just seven years after scientists discovered man-made chemicals were damaging the ozone layer, the Montreal Protocol was signed
Super-Earths are bigger, more common and more habitable than Earth itself
Astronomers are discovering more of the billions they think are out there
Scientists say exoplanet 100 light years from Earth may be covered with deep ocean
The exoplanet orbits "a nearby visual-binary M dwarf" star