Description
Astrophysicist Suzanna Randall explains in a new video what these inspiring words from Carl Sagan actually mean.
By Robert Lea
Are we really made of "star material"? What does this really mean?
"The world is within us. We are made of star matter. We are the world's way of knowing itself." Carl Sagan
Author Carl Sagan, astronomer and science communicator on the 1980s mini-series Cosmos, spoke many words of inspiration and understanding between us. Universe.
But arguably, nothing has resonated with the public as much as the above.
Sagan, who died in 1996 at the age of 62, spoke about the origin of humanity with such a spirit. In a new video, part of the
European Southern Observatory's (ESO) Chasing Stars series, astrophysicist Suzanna Randall explains what this phrase means and how it influences the context that makes up our physical relationship. What country is
metal made in
Randall explains that there are two problems with the small amount of heavy objects that are soon known to be metal. “But you can't make something as complex as the human body from just helium and hydrogen,”
explained.
"So where else do the many elements that make up our bodies and the rest of the world come from?" The first nebula formed - a large cloud of hydrogen and helium. As the superdense regions gather more and more from their surroundings, they eventually collapse under their own gravity, giving birth to the first generation of stars.
But like Earth back then, these stars contain hydrogen and helium and very little iron.
First generation stars combine hydrogen in their cores to form helium, and Randall points to our fourth star, the Sun.
6 billion year old star, do something today. Chapter
- Why do stars have to die to survive?
This means that when the first stars arose, Earth did not have enough heavy elements such as nitrogen, oxygen and carbon to form our bodies.
But that changed when the first generation of stars began to die. "When the hydrogen in a star's core is depleted, everything happens very quickly," Randall said.
"The star is entering a new stage of life called a supermassive star." During the
red giant, the cores of the first stars shrink. Meanwhile, its outer layers, where hydrogen and helium fusion still continue, will expand and magnify the star more than 100 times. The core will continue to contract until conditions at the center of the star (which is larger than the Sun) become hot and dense enough to begin mixing helium into heavier elements. Elements such as carbon and oxygen, which make up about 84 percent of our body, were born here.
"Most of the atoms in my body were formed deep within the stars in very hot stellar environments," Randall said. In
, the world finally got the "things" it needed for life, but the little things remained locked in the minds of the giants. Do not worry, the details will not be locked for long - at least not in cosmic terms.
"Stars with masses greater than eight solar masses continue to expand in their cores and are producing increasingly heavier material—as heavy as iron—" Randall said. “Sometimes they have to die and then they go with a bang.
They explode as supernovae.
Randall said that during cosmic explosions, some astronomers think that heavy energy, such as gold or platinum, is formed. But other scientists think it must have passed through two stellar bodies called neutrons. colliding stars and hence kilonova explosions create treasures. .
The supernova explosion of the first star on Earth is certain to take all the elements that the stars have created in their lives and throw them to Earth. of stars born from great dust clouds.
This means that the new generation of stars is more "metal-rich" than the previous generation. This continued until the birth of the third generation of stars, one of which was the Sun. From the
Nebula there is matter that formed the sun, but that did not become part of our star 4.6 billion years ago, then formed a disk of matter around the star called the protoplanetary disk.
As the name suggests, planets in the solar system (like Earth) are created from this data disk.
The elements that make up our body are derived from this disc.
"Carl Sagan turned out to be right. We're really stars," Randall said. "The life story of a star is also the story of the elements that make up our body. We are all part of this great cycle.
#nasa #cosmos #space
sourse : https://www.space.com/we-are-made-of-star-stuff-meaning-truth
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