Critical+Vocublary

Hertzsprung-Russel Diagram- The Hertzsprung–Russell diagram is a scatter graph of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their spectral types or classifications and effective temperatures.

Magnitude- a measure of brightness and brightness differences used in astronomy

=**Luminosity**-= Luminosity is the measurable property independent of distance

Nebula- A **nebula** is an interstellar cloud of dust, hydrogen gas, helium gas and other ionized gases.

Nebulae are often star-forming regions Main-sequence- The **main sequence** is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. It is the phase of a star as what the Sun is at.

Giant- A **giant star** is a star with substantially larger radius and luminosity than a main sequence star of the same surface temperature.

Super Giant- Is a little bigger then the Giant star. It is much bigger than Sun.

Supernova- Supernovae are extremely luminous and cause a burst of radiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months.

Dwarfs- A //white dwarf// is a star composed of electron-degenerate matter, thought to be the final stage. //Red dwarfs// are low-mass main-sequence stars

Galaxy- A **galaxy** is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust.

Fusions- connection of two or more distinct things/bodies Combining of the stars.

Black hole- A dark space that sucks everything in including light.

Neutron star- a star that has a small radius and is very highly dense.

Protostar-the early stage of the stars life time, after the gas collapes.

Scientific theory- a theory that explains the scientific obervations.

<span style="background-color: transparent; color: #000000; font-family: Comic Sans MS; font-size: 19px; text-decoration: none; vertical-align: baseline;">Big bang theory- the theory that was known for the creation of the universe.

<span style="background-color: transparent; color: #000000; font-family: Comic Sans MS; font-size: 19px; text-decoration: none; vertical-align: baseline;">Light year- the distance of the light to reach which is measured by years.

<span style="background-color: transparent; color: #000000; font-family: Comic Sans MS; font-size: 19px; text-decoration: none; vertical-align: baseline;">Light second- the distance of the light to reach which is measured by seconds.