References
Cosmological Expansion - Wikipedia
<a href="https://en.wikipedia.org/wiki/Expansion_of_the_universe">https://en.wikipedia.org/wiki/Expansion_of_the_universe</a>
Dark Matter - Wikipedia
<a href="https://en.wikipedia.org/wiki/Dark_matter">https://en.wikipedia.org/wiki/Dark_matter</a>
Dark Energy - Wikipedia
<a href="https://en.wikipedia.org/wiki/Dark_energy">https://en.wikipedia.org/wiki/Dark_energy</a>
Galaxy Rotation Curve - Wikipedia
<a href="https://en.wikipedia.org/wiki/Galaxy_rotation_curve">https://en.wikipedia.org/wiki/Galaxy_rotation_curve</a>
Virial Theorem - Wikipedia
<a href="https://en.wikipedia.org/wiki/Virial_theorem">https://en.wikipedia.org/wiki/Virial_theorem</a>
Lambda-CDM Model - Wikipedia
<a href="https://en.wikipedia.org/wiki/Lambda-CDM_model">https://en.wikipedia.org/wiki/Lambda-CDM_model</a>
Scale Factor - Wikipedia
<a href="https://en.wikipedia.org/wiki/Scale_factor_(cosmology)">https://en.wikipedia.org/wiki/Scale_factor_(cosmology)</a>
Annihilation (Particle Physics) - Wikipedia
<a href="https://en.wikipedia.org/wiki/Annihilation">https://en.wikipedia.org/wiki/Annihilation</a>
“Dark Matter--Hot or Not?” - Phys.org
<a href="https://phys.org/news/2016-08-dark-matterhot.html">https://phys.org/news/2016-08-dark-matterhot.html</a>
Hot Dark Matter - Wikipedia
<a href="https://en.wikipedia.org/wiki/Hot_dark_matter">https://en.wikipedia.org/wiki/Hot_dark_matter</a>
Cold Dark Matter - Wikipedia
<a href="https://en.wikipedia.org/wiki/Cold_dark_matter">https://en.wikipedia.org/wiki/Cold_dark_matter</a>

What are Dark Matter and Dark Energy? Part 2

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