So my initial question was whether or not light was considered matter. While googling this question, I came across this answer: http://answers.yahoo.com/question/index?qid=20080717210504AAngJQO In the top answer given, it is inferred that photons (light) are included in the definition of matter by the modern physics definition. So if light is matter, in what state is it? I'm very new to physics, and from my understanding matter is characterized by certain qualities, and can be put in a category such as a gas, liquid, etc... Thanks in advance for any answers.