Astronomers have observed the iPTF16geu tit-for-tying image of the Ia supernova to help calculate the speed at which the universe expands.

Astronomers have for the first time observed a four-part image of the Ia supernova, known as the "standard candlelight" of the universe, with the twisting and magnification of a natural "lens" of the universe.
the discovery will help the scientific community calculate more precisely the rate at which the universe expands.
a new study published in the Journal of Science on the 20th, the Ia supernova is called iPTF16geu, about 4 billion light-years from Earth.
Is also separated from Earth by a galaxy that acts as a "lens" about 2 billion light-years from Earth, imaging the supernova behind it in four different locations and increasing the brightness of the image by about 50 times.
Einstein predicted this strange astronomical phenomenon in general relativity, which has been observed many times before, but this is the first time astronomers have observed multiple images of the Ia supernova.
Ia supernova is a type of exploding star with a largely constant brightness, so it is considered astronomically "standard candlelight" for calculating the distance of distant galaxies.
The first time that multiple images of 'standard candlelight' were taken under the strong lens effect is a major breakthrough," the paper's lead author, Professor Ariel Gobar of Stockholm University in Sweden, said in a statement.
" supernova was first observed by Gobar et al. in September 2016 using a ground-based telescope based in California, USA, and has since been further observed using other telescopes and the Hubble Space Telescope.
the scientific significance of this discovery, the most important point is to determine more precisely the expansion rate of the universe, the so-called Hubble constant, by analyzing the difference in the time the light from the four images arrived on Earth.
, the Hubble constants obtained by different methods are nuanced, while the universe evolution and expansion scenarios predicted with these results are significantly different.
study also showed that the intermediate galaxy acted as a "lens" with a total mass 10 billion times that of the sun and a radius of nearly 3,000 light-years.
but it is relatively small compared to other cosmic "lenses".
and others believe that studying such unusual "lens" objects will help astronomers understand the universe's "lenses" from a new perspective, as well as dark matter and other research.
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