";s:4:"text";s:2880:" This suggests that dark matter either exclusively feels the effects of gravity or that it interacts only weakly via other forces. Useful tool: The existence of invisible dark matter can explain why observations on gravitational forces in distant galaxies indicate that there must be more matter than expected.Upon studying the motion of distant galaxies, astronomer Fritz Zwiky performed measurements to determine their mass by measuring the amount of light they emitted. For simplicity, you can think of spacetime as a blanket suspended above the ground. A problem with the argument is that the Black Holes would also affect the orbits of any galaxies or suns that passed by, and that has not been observed.One more concept is the existence of large quantities of particles, such as the neutrino, that do not readily interact with other forms of matter and are difficult to detect.Likewise, the existence of dark energy begs the question of why it only affects galaxies and not smaller objects of matter. “Gravitational waves are like a completely new sense for science,” Ali-Haimoud says. But only the most catastrophic cosmic events make gravitational waves powerful enough for us to detect. Since the luminosity and mass of the Sun have been calculated, the mass-luminosity relation is handy for astronomers to use to determine the mass of a distant star or galaxy: By measuring the luminosity of distant galaxies, Zwiky and other astronomers calculated their mass.The wavelength of a luminous object that is moving with respect to the observer changes according to the direction and velocity of the object. The theory predicted that objects that interact with gravity could disturb that fabric, sending ripples across it.Any object that interacts with gravity can create gravitational waves. Scientists have seen the gravitational effects of dark matter, so they know it must be there—or at least, something must be going on to cause those effects. “A new sense means new ways to look at all the big questions in physics.”10 more words that mean something different to scientists.Scientists think that, under some circumstances, dark matter could generate powerful enough gravitational waves for equipment like LIGO to detect.Four physicists share their journeys through academia into industry and offer words of wisdom for those considering making a similar move.No one knows for sure what dark matter is. Now that observatories have begun to record gravitational waves on a regular basis, scientists are discussing how dark matter—only known so far to interact with other matter only through gravity—might create gravitational waves strong enough to be found. Instead, it is one of many efforts to explain the increased rate of expansion of the Universe.The idea of invisible matter and energy is troubling to scientists and astronomers. ";s:7:"keyword";s:19:"marie calvet imdb";s:5:"links";s:755:"Holland America News,
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