system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar: The Last Airbender] How do firebenders draw power from a comet?

As the title says. Comets are made up primarily of ice and frozen gases. How do firebenders, which primarily draw power from the sun, gain such a huge boost in power from Sozin's Comet?
gpt
It's spiritual, not physical. To the Avatar World, it is essentially a moving star that appears every 100 years. When Zhao killed a fish, it turned off the moon and shut down Water Bender's ability to bend water, yet the Moon is a chunk of waterless rock.