The Universe has been defined as ‘everything that exists, everything that has existed, and everything that will exist’. In other words, the Universe is all of time, space, and its contents. What is currently known about the contents of the Universe can be categorized into three types of substance: normal matter, dark matter, and dark energy.
Normal matter is everything comprised of atoms, including stars, planets, and human beings. Only a small portion of the Universe (approximately 1-10%) is normal matter.
Dark matter can’t be seen with current technology because it doesn’t emit or absorb light, but scientists know it’s there because its gravitational effects on the motion of galaxies and stars can be observed. It’s estimated that a quarter of the Universe contains dark matter.
Dark energy makes up approximately 70% of the Universe, but nothing much more is known other than it’s a mysterious cosmic phenomenon that affects the expansion of the Universe.
The size of the Universe is another mystery, and it’s believed it has neither an edge nor a center.
So…that’s a lot of unknowns, and you’re probably asking, “What do we know about the Universe?
During a 2008 interview, Dr. Neil deGrasse Tyson was asked “What is the most astounding fact you can share with us about the Universe?” His answer is recited in this short video, The Most Astounding Fact, from Max Schlickenmeyer.
Dr. Clifford V. Johnson is a professor in the Physics and Astronomy department of the University of Southern California, and he’s been awarded the Institute of Physics Maxwell Medal and Prize (2005) and a Simons Foundation Fellowship (2016). His research focuses on the development of theoretical tools for the description of the basic fabric of Nature in pursuance of an understanding of the origin, past, present and future of the Universe. Dr. Johnson is also the author of The Dialogues: Conversations About the Nature of the Universe*, a graphic, novel-style non-fiction science book that uniquely brings the reader into conversations about exploring the Universe. It’s a fun read for the non-expert. On February 2, 2018, Dr. Johnson talks about his work and the creation the book at the Griffith Observatory in Los Angeles, California. If you missed the live stream broadcast of the event, there’s still time to watch a video recording. Just click/tap the “Watch Again” button on the video player below ↓
From the “Big Bang” to black holes, Dr. Neil deGrasse Tyson speaks about the mysterious Universe in a language we can all understand during a lively talk on May 3, 2017. There’s still time to watch — just click/tap “Watch Again” on the video player below ↓
Universe: Dark Energy, Dark Matter – NASA Science (contents of the Universe explained)
Questions and Answers: What is an atom? (defined & described in simple terms) The Thomas Jefferson National Accelerator Facility (Jefferson Lab)
The human body — what is it made of? (cells, molecules and atoms within the human body) Socratic.org (Anatomy & Physiology)
NASA App (FREE to download for smart phones, tablets & digital media players) Includes a huge collection of NASA content, including images, videos on-demand, NASA Television, mission information, and much more.
Digital Universe Atlas, a 3-D atlas of the Universe developed by the Hayden Planetarium of the American Museum of Natural History (FREE to view and download)
*Zeester Media LLC may receive a small commission should you purchase a book via a link on this page. This in no way affects the price you pay for the purchase.
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