Answer :
A nebula is a cloud of gas and dust that gives rise to stars. The lone star can shine on its own for a very long time. They are not everlasting, despite the fact that they shine for a very long period. These observations allow us to examine the inside of stars of various ages, each of which has a unique interior temperature and set of circumstances.
How do stars develop?
In frigid clouds of gas and dust, stars form. Because dust is particularly opaque to optical and ultraviolet light, neither wavelength will get through the star-forming zone. Although less opaque than dust, gas remains opaque nonetheless. (b) Infrared, microwave, and radio wavelengths all easily penetrate dust. Additionally, dust scatters IR wavelengths to UV-optical light, which makes newborn stars and other dusty objects even luminous in the IR. Atomic and molecular gas that is cool (T 50 k) and dense is visible in the IR and also emits line radiation in the submm and radio.
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