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8th Astronomy
Astronomy
Term | Definition |
---|---|
Universe | Outer space and everything in it. |
Star | An object made of gas that gives off energy. |
Nebula | A large cloud of gas and dust in space where stars form. |
Galaxy | A large grouping of stars in space. |
Spiral Galaxy | A galaxy with a bulge in the center and distinctive spiral arms. |
Irregular Galaxy | A galaxy with an irregular shape. |
Elliptical Galaxy | A spherical or elongated-shaped galaxy. |
Milky Way Galaxy | The name of the galaxy where we live. |
Magnitude | Brightness of star based on distance. |
H – R Diagram | Shows the classification of stars (magnitude, luminosity, and temperature). |
The sun | Main sequence star which the planets and other objects in our solar system revolve. |
Luminosity | The brightness of an object in space compared to our sun. |
Big Bang | The theory that is the leading explanation about how the universe began. |
Protostar | Young star still gathering mass |
Main Sequence Star | Stage after protostar. Star that begins hydrogen fusion. |
Red Giant | Stage after main sequence. No more hydrogen fusion. Star begins to cool down and increase in size. |
White Dwarf | Stage after red giant. Remaining core of red giant. |
Supernova | Stage after red supergiant. Explosion that throws out elements into space. |
Black Hole | Stage after supernova. Core collapses on itself. Intense gravitational pull not even light escapes. |
Black Dwarf | Stage after white dwarf. |
Neutron Star | Stage after supernova. Small dense collapsed core of massive star. |