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In terms of Across:
Down:
Stellar Nebula: The life of a star begins in a stellar nebula, which is a cloud of gas and dust in space. Gravity causes this cloud to collapse in on itself and become more dense.
Protostar: As the cloud collapses, it forms a protostar, which is a hot and dense ball of gas. Nuclear reactions begin in the protostar's core, causing it to emit light and heat.
Therefore, in terms of Main Sequence: When the nuclear reactions in the protostar's core stabilize, the star enters the main sequence phase. This is the longest phase in a star's life cycle, during which it fuses hydrogen into helium in its core.
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ACROSS
3 white dwarf that has cooled down in temperature; is invisible because it no longer emits light
15 one of the endings of a star that has a mass 4-8 times greater than our Sun; are very dense
6 this is what a low or medium life star will become later in its life; typically have the same mass as our Sun, but only a bit larger than the Earth
7 the explosion of a star when it has reached the end of its lifetime; are no longer stars, and are seen as bright points of light in the sky
8 the dying stage of a star; they become larger and this color due to the decrease in temperature
9 burn up their fuel more quickly than regular stars; soon all fuels will run out and the core will collapse
10 places in space so strong that not even light can escape; may occur when a star is dying
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this may be the beginning or the end of a star's life; a cloud that is made up of dust, helium, and hydrogen, and plasma
2 this is what 90% of stars in the sky are; they fall out of balance when all the fuel has been used up 4 this is the starting point of a star's birth, lasting about 100,000 years; mainly made of helium and hydrogen particles, with a relatively low temperature
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Rewritten by : Barada
Final answer:
Stars, such as our Sun, go through a life cycle from birth in a nebula to becoming a main sequence star, evolving into a red giant, and ending as a white dwarf after passing through a planetary nebula phase. For more massive stars, the end comes with a supernova explosion, resulting in a neutron star or black hole.
Explanation:
The life cycle of a star, such as our Sun, involves several stages that can be compared to human life stages such as prenatal, birth, adolescence, adulthood, middle age, old age, and death. Stars are born in nebulae, where clouds of dust and gas collapse under gravity to form protostars. As a protostar gains mass, it becomes hot enough to trigger nuclear fusion in its core, thereby becoming a main sequence star like our Sun. This is the longest stage of a star's life, comparable to human adulthood.
After the main sequence, a star like our Sun enters the red giant phase, where it expands considerably due to changes in nuclear fusion processes. Eventually, the outer layers are shed, and the star becomes a planetary nebula. At the center remains a white dwarf, which is the stellar remnant after the outer layers have been ejected. For massive stars, the life cycle ends with a supernova explosion, leaving behind a neutron star or black hole.
