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The majority of the gas in nebulae consists of molecules of hydrogen and Stars form from the gravitational collapse of large clouds of interstellar material.
17 Dec 2015 Hydrogen gas at some point clumped together due to gravity and the hydrogen atoms will form a spinning cloud of gas within the nebula.
A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally . Similar nebulae not illuminated by stars do not exhibit visible radiation, but may be detected as opaque clouds blocking light from luminous objects Planetary nebulae form when low-mass asymptotic giant branch stars nova.

Star formation is the process by which dense regions within molecular clouds in interstellar The nearest nebula to the Sun where massive stars are being formed is the Orion nebula, 1,300 ly (1.2?1016 km) away. . fusion begins, and the outward pressure of the resultant radiation slows (but does not stop) the collapse.
Stars form inside relatively dense concentrations of interstellar gas and dust known are dense, they are opaque to visible light and are known as dark nebula. How do we know this is happening if it takes so long and is hidden from view in
Star Formation. Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. As the cloud collapses, the material at the center begins to heat up.
24 Dec 2015 And eventually, and with enough gravitational attraction between clouds, this matter can coalesce and collapse to forms stars and planetary
Diffuse nebula are the clouds of material formed from the explosions of population three, population two stars, and the left over hydrogen and helium from the
In some nebulae, stars form out of large clouds of gas and dust; once some stars have formed inside the cloud, their light illuminates the cloud, making it visible to us. These star formation regions are sites of emission and reflection nebulae, like the famous Orion Nebula shown in the picture on the right.

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March 2018