“dark matter” cannot be directly observed because

The so-called “Dark matter” cannot be directly observed because it gives off no radiation. This means that it does not interact with the light. Up until now, people have been asking "How do we know dark matter exists if we can't see it?" Scientists believe that there is something holding the universe together that explains why all the celestial bodies are in their motion.

Joke: i thought it said drake and josh at first answer: probably unsure about this law. depending on how long the time is.

The declaration of sentiments