- published: 24 Nov 2015
- views: 6783
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible from Earth during the night, when they are not obscured by atmospheric phenomena, appearing as a multitude of fixed luminous points because of their immense distance. Historically, the most prominent stars on the celestial sphere were grouped together into constellations and asterisms, and the brightest stars gained proper names. Extensive catalogues of stars have been assembled by astronomers, which provide standardized star designations.
For at least a portion of its life, a star shines due to thermonuclear fusion of hydrogen in its core releasing energy that traverses the star's interior and then radiates into outer space. Almost all naturally occurring elements heavier than helium were created by stars, either via stellar nucleosynthesis during their lifetimes or by supernova nucleosynthesis when stars explode. Astronomers can determine the mass, age, chemical composition and many other properties of a star by observing its spectrum, luminosity and motion through space. The total mass of a star is the principal determinant in its evolution and eventual fate. Other characteristics of a star are determined by its evolutionary history, including diameter, rotation, movement and temperature. A plot of the temperature of many stars against their luminosities, known as a Hertzsprung–Russell diagram (H–R diagram), allows the age and evolutionary state of a star to be determined.
NET or Net may refer to:
In computing and communication:
In business and finance as an antonym of gross:
NET as an acronym may refer to:
In broadcast and media:
In science and psychology:
In mathematics:
In other uses:
.net or .NET may refer to:
you don't have to take the bar exam to see
what you've done is ignoramus 103
what've I got to hang my hat on
you don't have a pot to pee in
all this just to be your friend
I was there until the end.
extortion and arson, petty larceny
I know you called - I know you called - I know you called -
I know you called - I know you called - I know you hung up my line
star 69
I know all about the warehouse fire
I know squirrelys didn't chew the wires
3 people have my number
the other 2 were with me.
I don't like to tell-tell but I'm not your patsy.
this time you have gone too far with me.
I know you called - I know you called - I know you called -
I know you called - I know you called - I know you hung up my line
star 69
why'd you put your quarter down on me?
this reads like some dork inside edition hard copy.
I can't be your character witness
I can't be your alibi
doorbell rings it's the FBI
we learned spy vs. spy
you my friend, are guilty as can be.
I know you called - I know you called - I know you called -
I know you called - I know you called - I know you hung up my line
I know you called - I know you called - I know you called -
I know you called - I know you called - I can't be your alibi