EALING: Looking deep into the universe’s past, astronomers have discovered a galaxy that’s surprisingly mature for its age. The star-forming galaxy A1689-zD1, described in the journal Nature, reveals that dust the stuff we’re made of – might have been able to accumulate much earlier than once thought.
cientists study extremely distant celestial objects because it’s a way to look back in time. For example, if you were to take a picture of the sun right now, that snapshot would actually show the sun as it was eight minutes ago, because it took that sunlight eight minutes to reach your camera on Earth. The same principle applies for a galaxy that is billions upon billions of light-years away – the image we see today shows the galaxy as it was many billions of years ago.
The problem is, it’s very difficult to see galaxies from the early eons of the universe’s 13.8-billion-year history. Because they’re so distant, they’re also exceedingly faint. But researchers managed to pick up A1689-zD1 because its light was being bent by a massive galaxy cluster called Abell 1689, which sits between A1689-zD1 and Earth.
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