153K views · 8.7K reactions | Dark matter is composed of particles that do not absorb, reflect, or emit light, so dark matter is material that cannot be observed directly. We know that dark matter exists because of the effect it has on objects that we can observe directly. But what is it? Why do we need to study it? Watch and learn more about the mystery of dark matter detection. | Massachusetts Institute of Technology (MIT) | Facebook

3.5K views · 211 reactions | No one knows what dark matter is, but it constitutes 80 percent of the matter in our universe. | Monitor | Facebook