Nevertheless, through a combination of theoretical calculations and the limited observations available, astronomers have pieced together a picture of what the earliest stages of stellar evolution are likely to be.But all directions on a spinning sphere are not created equal. Second, the timescale for the initial collapse—thousands of years—is very short, astronomically speaking. What is the name of the force that creates the birth of a star?Stars are just fascinating altogether with many facts. Stars are huge balls of Hydrogen and Helium that are formed in galaxies from great big clouds of gas and dust over billions…Q. Gravity continues to play a part in the stars birth and continued life cycle. Since each star spends such a tiny fraction of its life in this stage, relatively few stars are going through the collapse process at any given time. The mass of the star determines the colour of the star, which allows scientists categorise the type of star. Scientists can then also try and confirm the amount of energy the star can give off.Q. pulls the dust and gas together to form a protostar. Stars are formed from massive clouds of dust and gas in space. A star in the T-Tauri phase can lose up to 50% of its mass before settling down as a main sequence star, thus we call them pre-main sequence stars. The Star Formation Process "We had the sky, up there, all speckled with stars, and we used to lay on our backs and look up at them, and discuss about whether they was made, or only just happened." For more information and further reading on a stars life cycle, see TAB. Since stars are made of gas, we focus our attention (and our telescopes) on the dense and cold clouds of gas and dust that dot the Milky Way (see Figure 1).There are many molecular clouds that form only (or mainly) low-mass stars. If a star is created really large after its birth, the star will live for less time as a smaller star.With an infinite amount of stars in the universe, and the billions in our own galaxy, as we search through the stars that we can see with current technology, we… Figure 6: Propagating Star Formation. About 2200 young stars are found in this region, which is only slightly larger than a dozen light-years in diameter. In the region of the Orion Nebula, about 1% of the material in the cloud has been turned into stars. Many stars, however, are members of binary or triple systems, where several stars are born together. Older groups or clusters of stars can now be easily observed in visible light because they are no longer shrouded in dust and gas (Figure 5).By the end of this section, you will be able to:Take a journey through the Orion Nebula to view a nice narrated video tour of this region.Although we do not know what initially caused stars to begin forming in Orion, there is good evidence that the first generation of stars triggered the formation of additional stars, which in turn led to the formation of still more stars (Figure 6).The stars in Orion’s belt are typically about 5 million years old, whereas the stars near the middle of the “sword” hanging from Orion’s belt are only 300,000 to 1 million years old. Star Life-cycle-Supernovas.# 2. As you spin really fast, you are pushed against the wall so strongly that you cannot possibly fall toward the center of the cylinder. As the protostar rotates, it is much easier for material to fall right onto the poles (which spin most slowly) than onto the equator (where material moves around most rapidly). Star formation begins when gravity begins to dominate over heat, causing a cloud to lose its equilibrium and start to contract. Indeed, one of the most important discoveries from the study of star formation in the last decade of the twentieth century was that disks are an inevitable byproduct of the process of creating stars. The total quantity of molecular gas is about 200,000 times the mass of the Sun.
The Orion Nebula also contains a tight cluster of stars called the Trapezium (Figure 4).
You may have observed this same “equator effect” on the amusement park ride in which you stand with your back to a cylinder that is spun faster and faster.
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