How star songs could help improve Gaia’s overall map of our galaxy

How star songs could help improve Gaia’s overall map of our galaxy

Astronomers have developed a new way to measure cosmic distances by listening to the frequencies of the “music” played by vibrating stars that collectively act as a vast orchestra of different cosmic instruments.

Results can help European Space Agency (ESA) The Gaia satellite measures the positions of about two billion stars, as well as the distances between them Land And movements while building an accurate three-dimensional map of the place milky way.

Scientists usually use a process called… the view, the apparent shift in the position of an object when viewed from two different locations, to measure the distance to different stars. They then measure the angles of the star itself, using Gaia’s position spaceAn attempt at triangulation. But the problem is that the further away the star is, the smaller the apparent displacement of the parallax. The smaller the parallax offset, the more likely subtle systematic errors are to creep in, which can lead to bias in the measurements.

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