Matter is defined as that which 1) has mass and 2) has volume or takes up space. Mass is an intrinsic property whose base SI unit is the kilogram (kg). Volume is an extrinsic property—that is, a property or characteristic that depends on sample size—which describes a region in three...
Dark and stellar matter contribute equally to the mass within a sphere of radius 4.1Re or 1.0 R25 . There is no evidence of any significant difference... MJ Williams,M Bureau,M Cappellari - 《Monthly Notices of the Royal Astronomical Society》 被引量: 46发表: 2010年 Nitrogen isotopic relati...
The nature of the Massive Compact Halo objects seen in microlensing experiments and interpreted as dark matter in the Halo of our Galaxy remains a mystery. Arguments are presented that these events are probably not ordinary stellar or substellar objects,
Dark matter accounts for 23.3 percent of the cosmos, and dark energy fills in 72.1 percent [source: NASA]. Together, these materials make up a whopping 95.4 percent of the universe, so it's no wonder we're still trying to figure out exactly what dark energy is. Contents The Cosmic ...
Scientists have several candidates for the types of particles that make up dark matter. One possibility is that dark matter is made of WIMPs (weakly interacting massive particles) that would have 1 to 1,000 times more mass than a proton. Another candidate is the axion, a particle ten-trillio...
It is argued that the spectrum of cold dark matter particles on Earth has peaks in velocity space associated with particles falling onto the Galaxy for the first time and with particles which have fallen in and out of the Galaxy only a small number of times in the past. Estimates are ...
Another theory, which is a counterpoint to WIMPs, is something called MACHO’s, or “massive astrophysical compact halo object” (you really have to love astrophysicists’ ability to come up with acronyms). This would be a regular old matter, but stuff that doesn’t emit light that we can...
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It has an off-center bar running through the middle of it. One disrupted spiral arm continues to protrude disjointedly from the bar. The spiral arms may have been wrecked by gravitational interactions either with our Milky Way galaxy and its dark matter halo or from the LMC's close ...
Stratus: Low sheets of clouds that form less than a mile above the earth. Like a thick blanket over the Earth, they bring dark, gray days -- and, sometimes, drizzle. Nimbostratus: A very thick, dark layer of clouds that bring rain. (Nimbus is Latin for rain.) Cumulus: These are the...