Question

How do stars formed?

Answer 1

Answer:

Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds. These regions are extremely cold (temperature about 10 to 20K, just above absolute zero). At these temperatures, gases become molecular meaning that atoms bind together. CO and H2 are the most common molecules in interstellar gas clouds. The deep cold also causes the gas to clump to high densities. When the density reaches a certain point, stars form.

Since the regions are dense, they are opaque to visible light and are known as dark nebula. Since they don't shine by optical light, we must use IR and radio telescopes to investigate them.

Star formation begins when the denser parts of the cloud core collapse under their own weight/gravity. These cores typically have masses around 104 solar masses in the form of gas and dust. The cores are denser than the outer cloud, so they collapse first. As the cores collapse they fragment into clumps around 0.1 parsecs in size and 10 to 50 solar masses in mass. These clumps then form into protostars and the whole process takes about 10 millions years.

Answer 2

Answer:

sραcєs вєτωєєท τнє sταrs ρrєsєทτ iท α gαℓαxy αrє σccυρiє∂ вy нυgє cℓσυ∂s σƒ gαs αท∂ ∂υsτ, кทσωท αs iทτєrsτєℓℓαr cℓσυ∂s. cσทτrαcτiσทs нαρρєท iท τнis cℓσυ∂ ∂υє τσ sσмє ทατυrαℓ ∂isτυrвαทcє. вєcαυsє σƒ τнis, τнє ∂єทsiτy αท∂ τємρєrατυrє iท τнє cℓσυ∂ sταrτs iทcrєαsiทg αท∂ α ∂єทsє sρнєrє σƒ нστ gαs is ƒσrмє∂ ƒrσм τнє cℓσυ∂. ทυcℓєαr єทєrgy (єทєrgy rєℓєαsє∂ ∂υє τσ ƒυsiσท σƒ ατσмic ทυcℓєi) is gєทєrατє∂ ωiτн τнє вυrทiทg σƒ ƒυєℓ, ℓiкє нy∂rσgєท αท∂ нєℓiυм, iท τнє sρнєrє ωнєท iτ ατταiทs α sυƒƒiciєทτ αмσυทτ σƒ ∂єทsiτy αท∂ τємρєrατυrє ατ iτs cєทτrє. ∂υє τσ τнis єทєrgy gєทєrατiσท, τнє gαs sρнєrє вєcσмєs sєℓƒ ℓυмiทσυs αท∂ τнυs α ทєω sταr is ƒσrмє∂.