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be explained by basically modifying our theories of gravity. According to such ideas, there are multiple types of gravity, and the big-scale gravity governing galaxies differs from the gravity to which we are accustomed. Scientists have a couple of ideas for what dark matter may be. One leading speculation is that darkish matter consists of exotic particles that do not interact with regular matter or light however that also exert a gravitational pull. Several scientific teams, including one at CERN’s Large Hadron Collider, are at present working to generate darkish matter particles for study within the lab. For instance, based on standard physics, stars at the edges of a spinning, spiral galaxy ought to travel much slower than those near the galactic heart, where a galaxy’s visible matter is concentrated. But observations present that stars orbit at more or less the same speed regardless of the place they’re in the galactic disk. This puzzling outcome is sensible if one assumes that the boundary stars are feeling the gravitational effects of an unseen mass—dark matter—in a halo around the galaxy. The rest of the universe appears to be made of a mysterious, invisible substance referred to as dark matter and a force that repels gravity generally known as darkish energy . The seen universe—including Earth, the solar, different stars, and galaxies—is manufactured from protons, neutrons, and electrons bundled together into atoms. Perhaps some of the shocking discoveries of the twentieth century was that this strange, or baryonic, matter makes up lower than 5 percent of the mass of the universe. baryons (i.e., protons, neutrons, and atomic nuclei), which additionally make up the luminous stars and galaxies. Most of this baryonic darkish matter is predicted to exist within the type of gasoline in and between the galaxies. This baryonic, or strange, component of darkish matter has been determined by measuring the abundance of elements heavier than hydrogen that had been created in the first jiffy after the massive bang occurred 13.eight billion years in the past. But many in the field remained skeptical of Zwicky’s results until the 1970s, when astronomers Kent Ford and Vera Rubin made detailed studies of stars in the outer regions of the neighboring Andromeda galaxy. These stars have been orbiting the galactic core far too quickly, virtually as if some invisible material was gravitationally tugging on them and pushing them along — an statement scientists soon seen in galaxies all over the universe. Although WIMPs have long been the favored candidate for dark matter, they’re not
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