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Milky Way Much Lighter Than Neighboring Andromeda: Study For the first time, astronomers at the University of British Columbia (UBC) have calculated the mass of the Milky Way. Surprisingly, the scientists discovered that our galaxy is lighter than neighboring Andromeda. Yin-Zhe Ma, a postdoctoral fellow in the UBC's department of physics and astronomy, said "We couldn't believe it. We went back and checked our equations very carefully." He added that until now, scientists had a perception that the Milky Way and neighboring Andromeda weighed the same. The major reason behind this was that they are similar in size and structure. After determining a method to calculate the mass of both galaxies, the astronomers discovered that Andromeda is actually twice as heavy as the Milky Way. As per the researchers, the presence of more invisible dark matter in Andromeda attributes to its extra weight. According to the US space agency NASA, dark matter is believed to comprise more than 80% of the universe. "We don't know much about dark matter so this discovery means we'll get a chance to study it from within our own galaxy," said Ma. The research team at the UCB was also able to measure the expansion of the universe by calculating the motion of smaller satellite galaxies that orbit the Milky Way and Andromeda, he said, adding that this happened for the first time. In a bid to understand the interaction between the mystery material and gravity, Ma stressed that his team hopes to model Milky Way's dark matter. The University of British Columbia's astronomers joined hands with researchers at the University of Edinburgh, Carnegie Mellon University, and the NRC Herzberg Institute of Astrophysics for the study. This was later published in the journal Monthly Notices of the Royal Astronomical Society. (Image: Thinkstock)
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Andromeda je spiralna galaksija udaljena 2,5 milijuna svjetlosnih godina od nas. M31 je najbliža spiralna galaktika našoj galaksiji Mliječni put. Broj zvijezda u Andromedi je znatno veći nego u našoj galaksiji. Rezultat toga je dvostruko veći ukupan sjaj cijele galaktike od našeg Mliječnog puta. Treba napomenuti da je brzina stvaranja zvijezda u našoj galaksiji višestruko veća nego u Andromedi. U budućnosti, broj zvijezda u Andromedi i Mliječnom putu će biti podjednak. Pogledajte NASA-ine slike u visokoj rezoluciji! Andromeda je spiralna galaksija udaljena 2,5 milijuna svjetlosnih godina od nas. M31 je najbliža spiralna galaktika našoj galaksiji Mliječni put. Broj zvijezda u Andromedi je znatno veći nego u našoj galaksiji. Rezultat toga je dvostruko veći ukupan sjaj cijele galaktike od našeg Mliječnog puta. Treba napomenuti da je brzina stvaranja zvijezda u našoj galaksiji višestruko veća nego u Andromedi. U budućnosti, broj zvijezda u Andromedi i Mliječnom putu će biti podjednak.