I've heard there's a lot of "dark matter" in the Milky Way. What does that mean?
Who was Fritz Zwicky?
What is the missing mass problem?
Can you tell me more about dark matter?
Is there anything other than dark matter that we can only observe indirectly?
What is dark energy?
Here are some questions about this topic.
Click the question to read the answer!
Ask another question about this topic!
See a Full List of Topics
© 1999–2013 BrainPOP and BrainPOP's Licensees. All rights reserved.
Your use of the site indicates your agreement to be
bound by our
Terms of Use
and
Privacy Policy
.