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.