In astronomy, what does retrograde mean? And what connection does it have to astrology? We explain how planets move across ...

How hot is Mercury? Mercury's sun-facing side is scorched by temperatures of around 430°C, hot enough to melt lead. Without a substantial atmosphere to distribute heat away from the areas facing the ...

Opinions expressed by Forbes Contributors are their own. Jamie Carter is an award-winning reporter who covers the night sky. A few evenings ago I found myself in a remote layby in Utah close to ...

Permafrost has accumulated so much mercury that it could dwarf the amount in the oceans, soils, atmosphere, and biosphere ...

Levels have fallen dramatically in the atmosphere - but remained stable in tuna since 1971. Very old mercury lurks deep in the ocean and wells up into the waters where the tuna swim, experts say.