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May 9, 2024 · Recent research shows the main alternative theory to dark matter, Milgromian dynamics, is failing. Is dark matter’s main rival theory dead? There’s bad news from the Cassini spacecraft and...
Jul 30, 2021 · All the work put into teasing out what exactly dark matter is could be worth it. After all, it remains one of the biggest unexplained phenomena in particle physics.
- Andy Tomaswick
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What is the dark matter problem?
Does dark matter have gravity?
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What is dark matter?
- Matter Or Gravity?
- Comparative Testing
- Young and Old Galaxies
- Dark Matter For The Win?
So far, dark matter has never been observed directly—hence the name. What astronomers observe in the night sky are the consequences of matter that is potentially present: bending of starlight, stars that move faster than expected, and even effects on the motion of entire galaxies. Without a doubt all of these effects are caused by gravity, but the ...
Brouwer and her colleagues selected over 259,000 isolated galaxies, for which they were able to measure the so-called 'Radial Acceleration Relation' (RAR). This RAR compares the amount of gravity expected based on the visible matter in the galaxy, to the amount of gravity that is actually present—in other words: the result shows how much 'extra' gr...
Thus it seems that, at least one dark matter model does appear to work. However, the alternative models of gravity also predict the measured RAR. A standoff, it seems—so how do we find out which model is correct? Margot Brouwer, who led the research team, continues: "Based on our tests, our original conclusion was that the two alternative gravity m...
If it turns out that extra gas cannot explain the difference between the two types of galaxies, then the results of the measurements are easier to understand in terms of dark matter particles than in terms of alternative models of gravity. But even then, the matter is not settled yet. While the measured differences are hard to explain using MOND, E...
- Science X
Apr 15, 2024 · The only rule of physics that dark matter seems to follow is gravity: It has mass, apparently, and that mass has gravity and forms a vital part of the scaffolding of galaxies, galaxy clusters,...
May 9, 2018 · An elusive substance that permeates the universe exerts many detectable gravitational influences yet eludes direct detection. Physicists and astronomers have determined that most of the material ...
- Lisa Randall
- 2018
Aug 28, 2006 · August 28, 2006. 5 min read. What are dark matter and dark energy, and how are they affecting the universe? By David Biello. Space & Physics. Robert Caldwell, a cosmologist at Dartmouth...
Apr 4, 2024 · Dark matter represents a huge problem for scientists because, despite the fact it makes up around 85% of the matter in the universe and its influence prevents galaxies from flying apart as they...
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