They did not originate out of nothing. "Nothing" is a state that has never existed.
https://www.nap.edu/html/aanm/web/tier2text/orgins.htm
"The Origins of Stars and Planets
Like the giant galaxies in which they appear, stars and their planets form when clumps of gas and dust contract to much smaller sizes. During the first phases of star formation, each of these contracting clumps was too cool to produce visible light. Within these clumps, the attraction of each part for all the other parts caused the clumps to shrink steadily, squeezing their material into ever-smaller volumes. As the clumps continued to contract, the resulting increase in density caused a corresponding rise in temperature at the clumps' center. Eventually, as this central temperature rose above 10 million degrees, atomic nuclei began to fuse. The onset of nuclear fusion, which marks the birth of a new star, occurred nearly 5 billion years ago in the case of our Sun. In the case of the oldest stars that shine, this onset of nuclear fusion began 10 to 14 billion years ago."
Galaxial Red Shift - Everything is moving away from everything else. Why is that? Why are there no stars or galaxies measured to be older than 13.7 billion years?
Microwave Background - This was the first great confirmation of the Theory. There's a "boundary", and a "hum" to the Universe, just hanging out in the background, still crackling all these billions of years later. Why is it there? Where did it come from? What caused it?
Cosmic Neutrinos - This is the last great prediction of the Big Bang Theory. It was confirmed this year after decades of study. Why are they there? What is their purpose? Where did they come from?
You can't take the position that all things require a cause, but somehow exempt your creator deity from having said cause... It's an intellectually dishonest position to hold, unless you are going to be as equally critical of the concept of deity, which you are not.
So, outside of some quantum fluctuations, I can't say that anything is without cause. But it's still a broad generalization that we do not know to be Universally true. Therefore, this is a lost point of attack by creationists. It does equal damage to any position founded on the modern Theory of Knowledge.
As I've already shared with you earlier, it's called Nucleosynthesis. Without an unthinkable number of star lifetimes preceding it, the materials necessary for the formation of our planet would not have existed. There would be no material to accrete in the Planetary disc around the Sun without the process of Nucleosynthesis forming heavier elements in the bellies of stars, being later ejected into the interstellar medium upon their deaths. How can an atmosphere form around a planet that doesn't exist? Why are lighter elements found further away from the center of a stellar object? Do rocks sink in water?
These are the questions that you're asking - and you don't even realize it.
https://en.wikipedia.org/wiki/Nucleosynthesis
https://en.wikipedia.org/wiki/Stellar_nucleosynthesis
"Nucleosynthesis is the process that creates new atomic nuclei from pre-existing
nucleons, primarily protons and neutrons."
"With the formation of stars, heavier nuclei were created from hydrogen and helium by
stellar nucleosynthesis, a process that continues today. Some of these elements, particularly those lighter than iron, continue to be delivered to the interstellar medium when low mass stars eject their outer envelope before they collapse to form
white dwarfs. The remains of their ejected mass form the
planetary nebulae observable throughout our galaxy."
"Supernova nucleosynthesis within exploding stars by fusing carbon and oxygen is responsible for the abundances of elements between
magnesium (atomic number 12) and
nickel (atomic number 28).
[1] Supernova nucleosynthesis is also thought to be responsible for the creation of rarer elements heavier than iron and nickel, in the last few seconds of a
type II supernova event."
"Stellar Nucleosynthesis
Core fusion increases the atomic weight of elements and reduces the number of particles, which would lead to a pressure loss except that gravitation leads to contraction, an increase of temperature, and a balance of forces.
[1] A star loses most of its mass when it is ejected late in the star's stellar lifetimes, thereby increasing the abundance of elements heavier than helium in the
interstellar medium."
[QUOTEThis is how the Universe works. It's observable, daily.