1. Which of these can be reasonably approximated as a black body? (Circle all correct answers)
   1. the Sun
   2. the Moon
   3. an LED light
   4. a banana

2. Which of these are significant greenhouse gasses (circle all that apply)?

1. water vapor
2. CO2
3. nitrogen
4. methane

3. True or False: astronomer's can determine the temperature of a distant star by analyzing the wavelengths of light emitted.

4. True or False: The Earth emits "long-wave" radiation, the Sun emits "short wave" radiation