How much further back in time will Webb go? 🔭
Hubble is pushing its limits to new horizons.
Scientists released data from the Hubble Space Telescope on a star or star system roughly 900 million years after the Big Bang — the cataclysmic beginnings of the universe, according to a Wednesday studyThis object is far more distant than earlier observations of similar systems — which means we're looking at one of the earliest stages ever witnessed by humans of our universe. And in addition to its unwieldy size, the mystery object is incredibly distant.
It's so distant, in fact, that only the James Webb Space Telescope could top Hubble's incredible findings.The unspeakably distant object was nicknamed"Earendel," which means"morning star" or"rising light" in Old English. To view it, astronomers used— a feature of the universe where the light of distant objects is magnified by the gravity of closer ones. Scientists estimate Earendel's mass to be more than 50 times that of the sun, with a redshift of 6.
Redshift reflects how light"stretches" as it moves through the universe, but also serves as a cosmic timestamp — and thus a marker of distance — of astronomical objects. The larger the value of redshift, the farther away it is, which, in turn, implies a greater distance from us, the observers. Earlier observations of stars seen via gravitational lensing have been made in the past, at redshifts from 1 to 1.5. We don't know the temperature, mass, or spectral properties of the star, but this information might be revealed once
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