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in first, einstein relativity experiment used to measure a star's mass

in first, einstein relativity experiment used to measure a star's mass News Article With The full text news. The Resource Link is down the post and you can View this News Article in the source page.



in first, einstein relativity experiment used to measure a star's mass

the mass of stein 2051 b, a white dwarf star located about 18 light-years from earth, has been a subject of some controversy for over a century. now, a group of astronomers has finally made a precise measurement of the star's mass and settled a 100-year-old debate, using a cosmic phenomenon first predicted by albert einstein.  the researchers calculated the star's mass using carefully timed observations made by the hubble space telescope, which studied stein 2051 b when it eclipsed another, more distant star, as seen from earth. during this transit, the background star appeared to change its position in the sky, moving ever so slightly to the side, even though its actual position on the sky had not changed at all.  this cosmic optical illusion is broadly known as gravitational lensing, and its effects have been observed extensively throughout the universe, especially near very massive objects, such as entire galaxies. the effect occurs because a massive object warps the space around it and acts like a very large lens, bending the path of the light from the more distant object. in some cases, this creates the illusion that the background star has been displaced. [einstein's theory of relativity explained (infographic)]this image shows an einstein ring (middle right), which occurs when a massive object acts like a lens for light coming toward the observer from a background object. this phenomenon is known as gravitational lensing, and recently used for the fir...