Suppose Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be
A) 250 K, which is well below freezing.
B) 273 K, or about the freezing point for water.
C) 283 K, or about 5 K cooler than it is now.
D) 288 K, or about the same as it is now.
E) 293 K, or about 5 K warmer than it is now.
Question 2
Mars' magnetic field is so weak because
A) it spins much slower than Earth does.
B) it core may no longer be molten.
C) its core contains less iron than our own.
D) Both B and C are probable.
E) All of the above are correct.
Titan's dense atmosphere shrouds the moon beneath a tan haze in this image.
The effective temperature, or black body temperature, of the Sun (5777 K) is the temperature a black
The Sun as it appears from the surface of the Earth at sunrise.
Rivers on Mars and Earth
Greenhouse Effect
Sun's composition of Gases.