We understand that this concept should be how the spiral arms work. Therefore, the spiral arms of a galaxy are caused by a bigger disturbance that travels around the disk of the galaxy. They found that they do not orbit the center of the spiral at the same rate. To observe this wavelike action, physicists have studied the individual orbital patterns of the stars. In this wave, the stars are pulled closer together and then further apart, propagating the wave. We now understand the spiral arms of a galaxy to be a wave. ![]() A competing hypothesis was that the galaxy should be considered a type of fluid, and the stars that make up the galaxy are just being carried through the fluid by gravity, like cereal pieces swirling in milk. The shape of the arms would also not change much. This would imply that every part of the arm rotates around the center of the galaxy at exactly the same pace, like a wood screw being driven into a board. Originally, these spiral arms were thought to be rigid arms attached to the center of the galaxy. The movement and evolution of these spirals is not well understood in astrophysics. Many galaxies are in the shape of spirals, including our own Milky Way Galaxy. Galaxies come in all shapes, sizes, and colors. What new treatments are there for neurodegenerative diseases?.What new technology is coming around the corner?. ![]() What might life look like elsewhere in the Universe?.What is going on with the Earth’s climate?.What effects do different foods have on our bodies and health?.What do we know about autoimmune diseases?.How does technology impact our daily lives?. ![]() How do we feed people now and in the future?.How do scientists study drugs and vaccines?.How do microbes respond to changes in their surroundings?.How can microbes clean up the environment?.
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