1. a place for the burial of a corpse, esp beneath the ground and usually marked by a tombstone. 2. something resembling a grave or resting place: the ship went to its grave. 3. the grave a poetic term for death. 4. have one foot in the grave informal to be near death.
Without this greenhouse effect, the average surface temperature would be 255 degrees kelvin (-18 degrees Celsius or 0 degrees Fahrenheit); a temperature so low that all water on Earth would freeze, the oceans would turn into ice and life, as we know it, would not exist.
Earth sits much closer to the sun than Mars does and is thus more intensely subjected to the sunâs formidable power. Not only does the sun generate temperatures on its surface upwards of more than 10,000Â° F (5,538Â° C), but its core temperature is over 27 million degrees Fahrenheit (15 million degrees Celsius)!