Discovered: A far-off galaxy from the dawn of time
A fuzzy red splotch hidden behind nearby star clusters might just be the most distant galaxy ever glimpsed by human eyes
After the Big Bang, the mysterious creation event that birthed the universe, it took hundreds of millions, even billions of years for the void of space to fill itself with the galaxies and cosmic clusters we can observe today. Very little is understood about this infant period, a "cosmic dark age" when stars and planets were just beginning to form. But now, for the first time, astronomers have spotted a far-off galaxy believed to be born in this period, astonishingly close to the dawn of time. Here's what you should know:
What did scientists find, exactly?Astronomers caught a glimpse of what they think is the most distant galaxy ever seen. While it doesn't "look like much," the "fuzzy red orb" is an astonishing 13.2 billion light years away, says Rebecca J. Rosen at The Atlantic. That's not much older than the universe itself, and this tiny galaxy may have emerged less than 200 million years after the Big Bang. It's like an archeologist finding an incredibly old artifact that's still relatively intact.
How did they find it?John Hopkins University's Wei Zheng and his colleagues used NASA's Hubble and Spitzer space telescopes to search for galaxies hiding behind massive star clusters blocked from Earth's immediate field of vision. Together, the two telescopes caught five distinct wavebands that, although warped, could be combined to paint a faint composite of this far-off star system.
What can we learn from it?Researchers have pinpointed more than 100 galaxies born some 650 million to 850 million years after the Big Bang, but this is by far the oldest on record. Zheng and his team hope that studying it further will fill in history's gaps and give us a clearer picture of what the universe was like during this little-understood infancy, says Irene Klotz at Discovery News. The team expects a better picture to emerge when the Hubble's replacement, the powerful James Webb Telescope, launches in 2018.