8Jan/11Off
Infrared Belt
Infrared Belt
How can we determine the reflectivity of an asteroid?
1.by measuring its mass and radius
2.by comparing its brightness in visible light to its brightness in infrared light
3. by taking a photograph of it
4. by where it is located in the asteroid belt
2.by comparing its brightness in visible light to its brightness in infrared light
Here is why.
The light of an asteroid is reflected sunlight. Some of the sunlight is reflected and some is absorbed. Just like the Earth, when an asteroid absorbs light from the sun, it emits this absorbed light back into space as infrared, that is heat. If we compare the amount of visible light to the amount of infrared light, we can establish a ratio of the amount of incoming sunlight an asteroid reflects to the amount it absorbs.
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