claim: In fact, in recent years when cosmic rays should have been having their largest cooling effect on record, temperatures have been at their highest on record.
evidence: Having almost no atmosphere to retain heat, it has surface temperatures that vary diurnally more than on any other planet in the Solar System, ranging from 100 K (−173 °C; −280 °F) at night to 700 K (427 °C; 800 °F) during the day across the equatorial regions.
category: Mercury (planet)