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Galactic ‘natural lab’ helps develop techniques for measuring spatial distance


https://sputniknews.com/20221030/galactic-natural-laboratory-helps-work-out-space-distance-measuring-techniques-1102850769.html

Galactic ‘natural lab’ helps develop techniques for measuring spatial distance

Galactic ‘natural lab’ helps develop techniques for measuring spatial distance

The galaxy in question exhibits two distinct types of light sources – Cepheid variable stars and a supernova – offering scientists the means to “improve… 30.10.2022, Sputnik International

2022-10-30T17:28+0000

2022-10-30T17:28+0000

2022-10-30T17:28+0000

science and technology

galaxy

distance

the measurement

The Hubble Space Telescope

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Researchers using the Hubble Space Telescope have unveiled a photo of a distant spiral galaxy that could help astronomers measure distances to the most distant celestial bodies. Designated UGC 9391, the galaxy in question resides in the constellation of Draco, some 130 million light-years away The image of the galaxy was released late last month and is part of a set of observations made by the space telescope, which astronomers have used in the creation of the so-called “cosmic distance scale” – an expected “set of connected measurements” to help gauge how far away some of the most distant objects really are in space. that lie even farther away, astronomers must “rely on a set of measured correlations calibrated to nearby objects.” What makes UGC 9391 so convenient is the fact that this galaxy has light sources such as Cepheid variable stars and a supernova, giving researchers “a natural laboratory in which to compare two measurement techniques” and helping them to “improve their distance estimates”. “Improving the accuracy of distance measurements helps astronomers quantify how fast the universe is expanding – one of Hubble’s primary science goals,” the space agency noted.

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The galaxy in question has two distinct types of light sources – Cepheid variable stars and a supernova – offering scientists ways to “improve their distance estimates”.

Researchers operating the Hubble Space Telescope have unveiled a photo of a distant spiral galaxy that could help astronomers measure distances to the most distant celestial bodies.

Designated UGC 9391, the galaxy in question resides in the constellation of Draco, some 130 million light-years away.

The image of the galaxy was released late last month and is part of a set of observations made by the space telescope, which astronomers have used in the creation of the so-called ‘cosmic distance scale’ – a “set of connected measurements” that should help assess how far away some of the most distant objects in space really are.

As the European Space Agency explained in a statement accompanying the image of the galaxy, distance through space can only be directly measured for objects around 3,000 light-years away. For celestial bodies that lie even farther away, astronomers must “rely on a set of measured correlations calibrated to nearby objects.”

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What makes UGC 9391 so convenient is the fact that this galaxy has bright sources such as Cepheid variable stars and a supernova, giving researchers “a natural laboratory in which to compare two measurement techniques” and helping them to “improve their distance estimates”.

“Improving the accuracy of distance measurements helps astronomers quantify the rate at which the universe is expanding – one of Hubble’s primary science goals,” the space agency noted.



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