SPACEEEEEEE

• more particles join making the protostar bigger
• when tempreature and pressure are high enough, hydrogen nuclei fuse in fusion to create helium nuclei
• Fusion gives out lots of energy and keeps the core hot creating a main sequence star
• the force of gravity and the force of he fusion balance
• when hydrogen runs out there is no more fusion so forces are not equal and gravity pulls the star into a small ball. The process can happen again but hydrogen fusion creates elements up to irons weight
• a small star becomes a red giant and a big star becomes a super red giant
• Super red giants shine brightly due to fusion happening more and eventually they explode in a supernova. big super red giants condense into a hot core. Very big super red giants collapse in itself causing a black hole.
• Anything which orbits a planet is a satellite
• asteroids are made of rock and metal
• comets are made of ice and dust
• the smaller the orbit of an object, the faster the orbit
• Orbit is the curved pathway of one celestial object or spacecraft around another celestial object.
• The futher away a galaxy, the faster its moving
• red giants quickly become unstable and they get rid of their outer layers leaving a hot dense core which is a white dwarf. This then gets cooler and darker forming a black dwarf which doesn't have enough energy to emit light
• gravity pulls the nebula together to form a protostar
• a cloud of dust and gas is a nebula
• When the universe expands, the space between galaxies is stretched not because galaxies are moving
• gravity squeezes the protostar making it denser meaning there are more collissions increasing tempreature