B. Haq
Starts With a Bang
The fascinating story about the entire universe begins some 13.8 billion years ago with a big bang. A few millionths of a second after the Big Bang, the very first protons and neutrons of the grand universe take form, and minutes later, they combine into nuclei. The most basic building blocks of everything, from tiny microorganisms to gigantic galaxies, were officially created in those first few moments.
Cosmic dust of the Andromeda Galaxy seen in infrared light
Fast forward to a few hundred thousand years, and these rudimentary particles fuse together to form the first atoms of hydrogen and helium – the most abundant elements in the universe.
Gravity to the Rescue
Still, the universe in its infancy is unable to provide the ingredients necessary for life to take form. To add to the complexity, those precious atoms face the peril of disintegrating into the void. Luckily, by now, they are feeling the influence of gravity to bring them safely together.
Over a period of hundreds of thousands of years, gravity shapes dense regions. As lumps of gases draw together, they form massive discs swirling in the dark space.
A Star is Born
These discs start to shrink under the force of gravity, and temperatures at their centers rise to the point where they begin to combust. Suddenly, a primordial star is born from the collapse of this gas cloud. From this moment on, billions of stars are born and shine in the dark space. These first stars are several times greater than the size of our Sun, which is most likely a third-generation star.
Microscopic photo of comet dust (cosmic dust that comes from a comet)
The Essential Stuff
Nature has another use for these massive stars besides brightening up the darkness. These stars will also generate all the raw materials necessary for life. Inside their massive cores, intense heat causes atoms to collide, and brand-new elements are now produced. The universe reaches a new threshold as the very first atoms of oxygen, carbon, and nitrogen are fashioned into existence.
Sadly, all things must come to an end. As these stars use up all their energy, they will collapse and explode, shooting the newly created elements out into the unknown and vastness of the universe. The high energies of such an explosion will create additional heavier elements that combine with oxygen to form cosmic dust. Cosmic dust will spawn new generations of stars and their orbiting planets.
You, Me, and Everything
We all are the remnants of massive stars as they came to an end, churning out cosmic dust. Oxygen, carbon, and nitrogen atoms in our bodies were conceived in stars some 5 billion years ago. A human body is 65% Oxygen, 18.5% Carbon, 9.5% Hydrogen, and 3.2% Nitrogen. Not only us, but all matter that we see around us is also made from elements forged by distant stars.
Question
Which detail from the article shows a starting point of an event?
Responses
A These first stars are several times greater than the size of our Sun, which is most likely a third-generation star.These first stars are several times greater than the size of our Sun, which is most likely a third-generation star.
B Inside their massive cores, intense heat causes atoms to collide, and brand-new elements are now produced.Inside their massive cores, intense heat causes atoms to collide, and brand-new elements are now produced.
C Nature has another use for these massive stars besides brightening up the darkness.Nature has another use for these massive stars besides brightening up the darkness.
D We all are the remnants of massive stars as they came to an end, churning out cosmic dust.We all are the remnants of massive stars as they came to an end, churning out cosmic dust.
1 answer
The detail from the article that shows a starting point of an event is:
A These first stars are several times greater than the size of our Sun, which is most likely a third-generation star.
This choice indicates the birth of the first stars, marking a significant starting point in the timeline of cosmic evolution.
