2016 – A Boulder Odyssey

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Albert Einstein reshaped our understanding of the fabric of space. In his general theory of relativity inhe proposed the revolutionary idea that massive objects warp space, due to the effects of gravity. Until that time, Isaac Newton's theory of gravity from two centuries earlier held sway: Einstein's theory was experimentally verified four years later when a team led by British astronomer Sir Arthur Eddington measured how much the sun's gravity deflected the image of a background star as its light grazed the sun during a solar banc de binary auszahlung kindergeld 2017.

Astronomers had to wait a century, however, to build telescopes powerful enough to detect this gravitational warping phenomenon caused banc de binary auszahlung kindergeld 2017 a star outside our solar system. The amount of deflection is so small only the sharpness of the Hubble Space Telescope could measure it. Hubble observed the nearby white dwarf star Stein B as it passed in front of a background star.

During the close alignment, the white dwarf's gravity bent the light from the distant star, making it appear offset by about 2 milliarcseconds from its actual position. This deviation is so small that it is equivalent to observing an ant crawl across the surface of a quarter from 1, miles away.

The Hubble team measured the mass of a white dwarf, the burned-out remnant of a normal star, by seeing how much it deflects the light from a background star. This observation represents the first time Hubble has witnessed this type of effect created by a star.

Researchers had to wait a century, however, to build telescopes powerful enough to detect this gravitational warping phenomenon caused by a star outside our solar system. The amount of deflection is so small only the sharpness of Hubble could measure it.

This result matches theoretical predictions. Although Stein B has a companion, a bright red dwarf, astronomers cannot accurately measure its mass because the stars are too far apart.

Stars with a higher apparent motion across the sky have a greater chance of passing in front of a distant background star, where the deflection of light can be measured. The Hubble observations were challenging and time-consuming. The astronomers also had to measure the tiny amount of deflected starlight. The movement of the insect is very small, and the glow of the light bulb makes it difficult banc de binary auszahlung kindergeld 2017 see the insect moving.

It resides 17 light-years from Earth and banc de binary auszahlung kindergeld 2017 estimated to be about 2. The background star is about 5, light-years away. Jun 7, American Astronomical Society Meeting. White dwarf shows how gravity can bend starlight Albert Einstein reshaped our understanding of the fabric of space.

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