Researchers from Australia, the UK and the USA have just completed the most detailed survey of galaxies in the nearby Universe, which will reveal not only where the galaxies are but also where they are heading, how fast, and why.
Galaxies are tugged around by each other's gravity. By measuring the galaxies' movements, the researchers can map the gravitational forces at work in the local Universe, and so show how matter, seen and unseen, is distributed.
The survey shows strings and clusters of nearby galaxies on large scales in unprecedented detail, and has revealed more than 500 voids’ apparently empty areas of space with no galaxies.
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