Dark Matter is a theoretical form of invisible mass, which is believed to be present in galaxies, but has never been seen or detected. You've probably heard of it before, as it makes up a large part of the physics you find in textbooks. But how can something that's never been seen have so much scientific confidence? Furthermore, why can't we see dark matter to begin with? And if we can't see it, how do we know that it is really there? And if it's not there, what are the alternative ideas? These are the questions we will be aiming to answer, as we dive into the Dark Matter mystery.

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FOOTAGE:
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SOURCES OF INFORMATION:
- Dark Matter History: https://escholarship.org/content/qt2h...
- Britannica Piece on Dark Matter: https://www.britannica.com/science/da...
- Rubin et al. 1983 Paper: https://www.science.org/doi/10.1126/s...
- Newton & the Inverse-Square Law: https://www.physicsclassroom.com/clas...
- The Cosmic Web of Dark Matter: https://www.bbc.co.uk/iplayer/episode... | BBC's Universe with Professor Brian Cox
- Dark Matter Haloes: http://www.solstation.com/x-objects/d...
- Bullet Cluster: https://www.esa.int/ESA_Multimedia/Im...
- Lensing in the Bullet Cluster: https://arxiv.org/abs/astro-ph/0312273
- Dark Matter Experiments: https://www.smithsonianmag.com/scienc...
- Dark Matter Map: https://www.bbc.co.uk/news/science-en...
- MOND: http://www.scholarpedia.org/article/T...
- Entropic Gravity: https://www.newscientist.com/article/...

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TIMESTAMPS:
0:00 Introduction
1:53 What is Dark Matter?
5:00 Signs of Missing Mass
8:21 Lambda-Cold Dark Matter Model
11:21 Dark Matter in the Early Universe
14:12 Dark Matter Filaments
16:51 Dark Matter Haloes
20:22 The Bullet Cluster
22:30 Gravitational Lensing
24:23 Weakly Interacting Massive Particles
26:20 Search for Dark Matter
28:09 Annihilation Detection
31:00 Alternative Theories
32:57 Modified Gravity
35:31 Entropic Gravity
38:06 Dark Energy?

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