Now, web users can play 'cosmic slot machine' to study colliding galaxies

A new website will give everyone the chance to contribute to science by playing a 'cosmic slot machine' and compare images of colliding galaxies with millions of simulated images of galactic pile-ups.

These collisions, which astronomers call 'galactic mergers', could be the key to finding out why the Universe contains the mix of galaxies it does - some with trailing spiral arms, others more like compact 'balls' of stars.

Because the simulated images reflect the different variables involved in galaxy formation the data from people using the site, Galaxy Zoo Mergers, promise to revolutionize our understanding of these collisions.

Galaxy Zoo Mergers, which goes live on 24 November at http://mergers.galaxyzoo.org is an international project led by scientists from Oxford University in the UK and George Mason University in the US.

"Visitors to the Galaxy Zoo Mergers site use what's rather like a giant slot machine, with a real image of a galactic merger in the center and eight randomly selected simulated merger images filling the other eight 'slots' around it," said Dr. Chris Lintott of Oxford University's Department of Physics, galaxyzoo.org team member.

"By randomly cycling through the millions of simulated possibilities and selecting only the very best matches, they are helping to build up a profile of what kind of factors are necessary to create the galaxies we see in the Universe around us - and, hopefully, having fun too," he added.

Users do more than simply select images, they can also take directcontrol of the simulations - choosing 'more' or 'fewer stars' or 'flipping' galaxies - in order to provide an exact match to what we see in the Universe.

"By reconstructing these collisions, our users will help us understand how galaxies have changed over the history of the universe," said Dr. John Wallin, an Astronomer in George Mason University's Department of Computational and Data Sciences, galaxyzoo.org team member.

The project will focus on around 3,000 images of real galactic mergers identified through the Galaxy Zoo project.

It also features some new images of these mergers taken by the Hubble Space Telescope.

The next stage will be to investigate the 'before' and 'after' of these colliding galaxies to work out what caused them and what will happen next.

"These collisions take millions of years to unfold and so all we get from the Universe is a single snapshot of each one. By producing simulations, we will be able to watch each cosmic car crash unfold in the computer," said Anthony Holincheck, a galaxyzoo.org team member. (ANI)

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