A new Goldilocks for habitable planets

The search for habitable, alien worlds needs to make room for a second "Goldilocks," according to a Yale University researcher.

Three positive climate developments

While humanity's efforts to curb planet-warming emissions are nowhere near enough to avoid heating the world to catastrophic levels, tentative improvements show that progress is possible.

The coldest spot in the known universe

Everyone knows that space is cold. In the vast gulf between stars and galaxies, the temperature of gaseous matter routinely drops to 3 Kelvin, or 454 degrees below zero Fahrenheit.

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