![]() No longer able to produce sufficient energy to maintain its structure. Neutron star- if the remains are not massive enough to form a black hole, gravity pulls them together to form a small, very dense star called a neutron star. About once every century, a massive star somewhere in our galaxy runs out of fuel. The gravitational pull of a black hole is so strong that not even light can escape it. Black hole- if what is left is four or more times the mass of the Sun, gravity pulls the remains together to form a black hole. The outer layers of the supergiant are cast off and expand outwards.Ħ. Supernova- At the end of the red supergiant period the star rapidly collapses and then explodes into a supernova. Red supergiant- They fuse hydrogen into helium faster, and then become red supergiants.ĥ. Stars with considerably more massive than the Sun are hotter and brighter.Ĥ. The star is now in the main sequence part of its life-cycle. The outward pressure from the hot gases just balances the compression due to gravity. ![]() Fusion reactions like this release a lot of energy as electromagnetic radiation. Massive Main sequence star- eventually temperatures and pressures in the centre of the protostar become high enough to force hydrogen nuclei to fuse together and form helium. No fusion reactions happen inside a white dwarf and gradually it cools over about a billion years to become a black dwarf.ģ. White dwarf - The rest of the star is pulled together by gravity and collapses to form a white dwarf star. Shell of gas - The star remains a red giant for about a billion years before throwing off a shell of gas.Ħ. Other fusion reactions happen inside red giants, such as combining helium nuclei to form heavier elements.ĥ. The outer layers expand to form a red giant star, much larger than the original star. ![]() Red giant- when they have fused most of their hydrogen into helium, the core is not hot enough to withstand gravity and it collapses. Remain stable for about 10 billion years.Ĥ. Main sequence star- eventually temperatures and pressures in the centre of the protostar become high enough to force hydrogen nuclei to fuse together and form helium. As more mass is attracted, the cloud’s gravitational pull gets stronger and heats the material more- this is a protostar.ģ. As the cloud contracts it becomes hotter as it spirals inwards and May start to glow. Protostar - dust & gases are pulled together by their own gravity. Nebula - a cloud of dust & gases (mainly hydrogen).Ģ. Massive stars transform into supernovae, neutron stars, and black holes while average stars just like the sun, end life as a white dwarf star surrounded by.
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