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By Catholic Online (NEWS CONSORTIUM)

8/1/2014 (8 months ago)

Catholic Online (www.catholic.org)

Peering deeper into space is also peering into the past.

Astronomers have discovered a virtual magnifying glass in space that allows them to look farther back in time than they normally can, to an age when the universe was young and contained less mysterious dark matter.

Images which reveal the galaxies in question. They may look like pixels, however by examining light in fine detail with sensitive instruments astronomers can reveal a lot of basic knowledge about the objects.

Images which reveal the galaxies in question. They may look like pixels, however by examining light in fine detail with sensitive instruments astronomers can reveal a lot of basic knowledge about the objects.

Highlights

By Catholic Online (NEWS CONSORTIUM)

Catholic Online (www.catholic.org)

8/1/2014 (8 months ago)

Published in Technology

Keywords: space, gravitational lensing


LOS ANGELES, CA (Catholic Online) - Astronomers Kennith Wong and Sherry Suyu of Academic Sincia Institute of Astronomy in Taiwan have discovered a massive, distant elliptical galaxy in Hubble Space telescope images. By chance, behind that galaxy is another one, far older and more ancient that what we normally can see, even with the most sensitive instruments. We are able to see the galaxy behind the giant elliptical because the elliptical in the foreground acts as a magnifying glass.

Massive objects in space can distort the light from objects behind them, allowing them to serve as magnifying glasses. This effect is known as gravitational lensing and it was proposed theoretically decades before it was observed.

St. Dominic de Guzman, patron saint of astronomers.


Today, astronomers use this phenomenon to peer at distant objects deep in space, but there's a catch: we can't move the magnifying glass, so we're stuck seeing whatever we can see through the lensing effect and nothing more.

Still, objects like the massive elliptical galaxy are key to making observations of the early universe.

Behind the elliptical is a small spiral galaxy which is just forming -or at least it was just forming about 10.7 billion years ago. Another curious feature of space is that it takes time for light to travel. In this case, the light from the forming spiral took 10.7 billion years to reach observers on Earth. Since the universe formed about 13.7 billion years ago, the galaxy which astronomers see appears as it did not long after the universe formed.

These observations are important because they provide information about how the universe may have been formed.

The most interesting observation is that the ancient, small spiral does not have the same quantity of dark matter as modern galaxies do. This suggests that dark matter forms and accumulates over time. Dark matter is an unknown form of mass which is thought to bind entire galaxies together by gravity. Scientists only know what dark matter does, but not what it is.

Why is the ancient spiral deficient in dark matter compared to modern galaxies? It's a mystery that requires more research.

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