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Galaxies, Nebulas, and Stars!
Transcript of Galaxies, Nebulas, and Stars!
Galaxies can be identified in three groups: spiral, elliptical, and irregular. Spiral galaxies have long arms of gas and stars that swirl into the middle which is a ball of gas. Elliptical galaxies are big balls of stars, and dust with long arms of gas sticking out. Irregular galaxies are just random shapes of stars and gas. Nebulas are the spaces between the stars that look like clouds. “Nebulae” is a Latin word for cloud. There are many clouds of dust and gas. Nebulas can seem very thick and dense, but they are actually very thin. In an average nebula there are about one thousand particles of dust and gas per cubic meter. A cubic meter is about the size of a marble. That’s small compared to the billions of particles of dust we breathe in. Reflection Nebulas are when dust mixed with gas makes a wispy shape around the brightest stars thus creating a reflection. It shows up blue in photos. Stars are big balls of gas and dust, and don't have the five pointed shape so often believed. They are big balls of light, hot gas, and dust being held together by gravity and nuclear energy. Stars have life spans and most last for billions of years. Stars are constantly forming and exploding. A star is born when: Gravity has energy which is transformed into heat. As a result the temperature inside the star is getting hotter. The heat keeps going up. After a while nuclear fusion starts. The energy from the nuclear fusion and the heated gas goes crazy and explodes! Thus a star is born.
In conclusion, this project taught a great deal about galaxies, nebulas, and stars! I hope you learned alot and enjoyed yourself!