NASAs Hubble Telescope has captured some of the universes brightest infrared galaxies on camera, thanks to some closer galaxies that act like magnifying glasses.
These luminous galaxies are up to 10,000 times brighter than our Milky Way galaxy, and we are able to see them because of a phenomenon called gravitational lensing. Galaxies or clusters of galaxies with large gravitational fields create a lense that magnifies what is behind them.
Gravitational lensing magnifies them so that you can see small details that otherwise are unimaginable, said said lead researcher James Lowenthal of Smith College in Northampton, Massachusetts in a NASA article. We can see features as small as about 100 light-years or less across.
Gravitational lenses also come with their problems. Like looking at something magnified through water, researchers must first understand how gravitational lensing is distorting the image.
The bright and distant galaxies are also incredibly industrious star factories, churning out 5,000 to 10,000 times the number of stars as the Milky Way. What is strange is that theyre doing it with the same amount of gas as the Milky Way. NASA researchers have a few theories as how this can be, but so far no answers.
Weve known for two decades that some of the most luminous galaxies in the universe are very dusty and massive, and theyre undergoing bursts of star formation, Lowenthal said. But theyve been very hard to study because the dust makes them practically impossible to observe in visible light. Theyre also very rare: they dont appear in any of Hubbles deep-field surveys. They are in random parts of the sky that nobodys looked at before in detail. Thats why finding that they are gravitationally lensed is so important.
As of June 6, Lowenthals team was halfway through its Hubble survey of 22 galaxies.
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NASA Gets Images of Ultra Bright, Distant Galaxies Thanks to Other ... - The Epoch Times
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