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Can we see stars outside our Milky Way? (2016). Retrieved August 22, 2017, from http://earthsky.org/tonight/can-we-see-stars-outside-our-milky-way-galaxy
Dark matter: Invisible dark matter makes up most of the universe … (n.d.). Retrieved August 15, 2017, from https://home.cern/about/physics/dark-matter
Emspak, J. (2016). Does the Universe Have an Edge? Retrieved August 24, 2017, from https://www.livescience.com/33646-universe-edge.html
Hawking, S. (2011).Formation of the Solar System. [Video file]. Retrieved August 19, 2017, from https://www.youtube.com/watch?v=Uhy1fucSRQI
How Far Away is the Farthest Star? (2013). Retrieved August 22, 2017, from http://www.armaghplanet.com/blog/how-far-away-is-the-farthest-star.html
Howell, E. (2017). What Is the Big Bang Theory? Retrieved August 29, 2017, from https://www.space.com/25126-big-bang-theory.html Infrared homing (n.d.). Retrieved August 22, 2017, from https://en.wikipedia.org/wiki/Infrared_homing Jones, A. Z.(2017).
Multiverse Definition and Theory: What Is a Multiverse? Can It Be Real? Retrieved August 24, 2017, from https://www.thoughtco.com/multiverse-definition-and-theory-2699273
NASA’s Hubble Finds Universe Is Expanding Faster Than Expected. (2016). Retrieved August 15, 2017, from https://www.nasa.gov/feature/goddard/2016/nasa-s-hubble-finds-universe-is-expanding-faster-than-expected Ventrudo, B. (2014).
How stars work. Retrieved August 19, 2017, from http://oneminuteastronomer.com/9986/stars-milky-way/
What is a singularity? (2015). Retrieved August 15, 2017, from http://curious.astro.cornell.edu/physics/86-the-universe/black-holes-and-quasars/general-questions/441-what-is-a-singularity-beginner