About 20 million years ago, in a galaxy not so far away, a large star exploded and sent elements representing the building blocks of life racing through space.

About a year ago, by chance, as the light it emitted reached Earth, a team of scientists in Israel observed it and for the first time collected data on the earliest stages from such an explosion, known as a supernova.

The picture they are putting together offers a detailed look at the origins of crucial elements around us, like the calcium in our teeth and the iron in our blood.

"This was the first opportunity we had to observe the, this explosion forces, this, this light escaping for the first time from the air around the star," Weizmann Institute of Science astrophysicist Avishay Gal-Yam said on Wednesday (March 27) in his laboratory in Rehovot.

The findings, published on Wednesday in the journal Nature, also indicate that the giant star, located in a neighboring galaxy called Messier 101, likely left behind a black hole after it exploded.

An amateur astronomer who happened to be watching that galaxy tipped off the researchers that something appeared to be occurring. They quickly focused their ground-based telescopes at the star and began documenting the early stages of the explosion.

The team, which included doctoral student and study lead author Erez Zimmerman, contacted NASA, which changed its schedule and aimed the Hubble Space Telescope at the supernova.

"We told NASA - this is the time, stop whatever it is you're doing. Hubble stop whatever it is was doing, and turn it as quickly as it can to observe our target. And he did it. It was the fastest ever observations of this type that Hubble did," Gal-Yam said.

And this allowed early-stage observation of ultraviolet light from the explosion, which is blocked by the atmosphere and not picked up on Earth.

Along with tracking elements like carbon, nitrogen and oxygen blasted into space, the ultraviolet data showed a discrepancy between the star's initial mass and the mass it ejected into space during the explosion.

"One of the interesting results from this paper, for example, is that we suspect that after the explosion, a black hole was left behind," said Gal-Yam.

Black holes are extraordinarily dense objects with gravity so strong that not even light can escape.

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Having created a sort of fingerprint of the supernova from start to finish, Gal-Yam said it could help scientists identify impending supernovas elsewhere.

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(Production: Sebastian Rocandio, Juarawee Kittisilpa)