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Dark matter explains two things that we currently don't know how else to explain: how the galaxies are rotating so fast without flying apart and why we see grav
by ObviousScience 12y ago
Dark matter explains two things that we currently don't know how else to explain: how the galaxies are rotating so fast without flying apart and why we see gravitational lensing from seemingly otherwise empty space.
- coder23 12y agoI have never heard about detecting gravitational lensing coming from empty space. Do you have any info/references on that?
- ObviousScience 12y agoHere are the first links that came up when Googling it: http://www.lsst.org/lsst/science/scientist_dark_matter http://www.lsst.org/lsst/science/scientist_dark_matter http://scienceblogs.com/startswithabang/2011/04/20/how-gravitational-lensing-show/ http://scienceblogs.com/startswithabang/2011/04/20/how-gravi... http://www.ifa.hawaii.edu/~ger/ASTRO-110_sp08/Lecture28_DarkMatter.pdf http://www.ifa.hawaii.edu/~ger/ASTRO-110_sp08/Lecture28_Dark...
- nitrogen 12y agoWhen two galaxy clusters collide, the ordinary matter can get slowed down by non-gravitational interactions, leaving the dark matter to continue on inertia and gravity alone. Closest references I could find: http://phys.org/news/2013-02-dark-galaxies-ways-collision-hefty.html http://phys.org/news/2013-02-dark-galaxies-ways-collision-he... "In the Bullet Cluster, a collision between two galaxy clusters appears to have caused a separation of dark matter and baryonic matter." - https://en.wikipedia.org/wiki/Dark_Matter https://en.wikipedia.org/wiki/Dark_Matter