https://padlet.com/1609443/3igjdudaba1f Made with serendipity en-us 2018-03-13 14:48:52 UTC 2025-12-20 00:52:36 UTC hello@padlet.com 1609443 https://padlet.com/1609443/3igjdudaba1f/wish/243788863 2018-03-19 22:53:48 UTC https://padlet.com/1609443/3igjdudaba1f/wish/243788863 1609443 https://padlet.com/1609443/3igjdudaba1f/wish/245027578 Dark matter is one of the most mysterious things that we know about. We do not know what it exactly is, or why it is here, but that does not mean we do not know what it does. Dark matter was first proposed by Fritz Zwicky in 1933 to explain how the Coma galaxy is gravitationally bound. 

]]> 2018-03-22 14:43:39 UTC https://padlet.com/1609443/3igjdudaba1f/wish/245027578 1609443 https://padlet.com/1609443/3igjdudaba1f/wish/245030178 People started considering thoughts about black matter when it was realized that every galaxy is controlled by gravity, but some do not have anything to gravitate to, so where do they go? Motions of the stars are due to matter of other things. When astronomers add up all the visible matter with all different kinds of telescopes, and it does not total enough to explain the motions they observe. 

]]> 2018-03-22 14:47:15 UTC https://padlet.com/1609443/3igjdudaba1f/wish/245030178 1609443 https://padlet.com/1609443/3igjdudaba1f/wish/245031065 Dark matter makes up over ninety percent of our galaxy, and is not visible to the human eye, or even telescopes! It can only be measured based on its gravitational effects on planets and stars. Motions of the stars show how much matter is there, visible or not, and this gives some hints at the existience of dark matter.

]]> 2018-03-22 14:48:34 UTC https://padlet.com/1609443/3igjdudaba1f/wish/245031065 1609443 https://padlet.com/1609443/3igjdudaba1f/wish/245031617 This breaks the laws of gravity, so we know there must be another explanation. We call the missing material that bounds visible matter, ‘dark matter’ due to its inability to be seen. It does not emit any light or energy, and there fore can not be seen.]]> 2018-03-22 14:49:24 UTC https://padlet.com/1609443/3igjdudaba1f/wish/245031617 1609443 https://padlet.com/1609443/3igjdudaba1f/wish/245037296 “What Is Dark Matter?” Astronomy.com, Jack Kessler, 1 Feb. 2007, www.astronomy.com/magazine/ask-astro/2007/02/what-is-dark-matter]]> 2018-03-22 14:57:37 UTC https://padlet.com/1609443/3igjdudaba1f/wish/245037296 1609443 https://padlet.com/1609443/3igjdudaba1f/wish/245037668 “How Do We Know Dark Matter Exists If We Can't See It?” NASA, NASA, spaceplace.nasa.gov/review/dr-marc-space/dark-matter.html.]]> 2018-03-22 14:58:10 UTC https://padlet.com/1609443/3igjdudaba1f/wish/245037668 1609443 https://padlet.com/1609443/3igjdudaba1f/wish/245038082 Redd, Nola Taylor. “What Is Dark Matter?” Space.com, www.space.com/20930-dark-matter.html.

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