Monday, August 22, 2011

How The Solar System Formed

It all started with the Big Bang, but thats another story, then, gasses and particles started to get compressed, all by gravity, until so much particles were in one place, that they started to vibrate, create friction and suddenly collapsed and started hydrogen fusion, which created a giant ball of gas we now know as our sun. Gravity from this ball of gas started attracting more and more matter to its path, this matter crashed with other matter to create planetesimals, this planetesimals started collapsing and collecting more matter, then becoming proto-planets, later becoming true planets by addition of matter.  The inner planet's light gasses were blown away by the sun's heat, while the coldness in outer solar system enabled the outer planets to keep those gasses... Our moon, a theory explains, (Big Splat) that it came to us by a collision when our Earth was just million years old: 4.4 billion years ago, it was a collision with a "rock" the size of Mars... the collision created debris around us that eventually joined to us or, created our moon.

This is the EXTREMELY basic and simple, if you wish to learn more:

Sunday, June 12, 2011


Stars (Facts):

Simply explained as a "Rotating sphere of hot ionized gas"


Spectral Type M:    Occupying the lowest range (lowest in surface temperature)  ;  Color: "red" ;  App. Surface temperature: under 3,500 K  ;  Average Mass (The Sun= 1):  0.3  ;  Example:  Betelgeuse

Spectral Type K:   Color: Orange to Red  ;  App. Surface temperature: 3,500- 5,000 K  ;  Average Mass (The Sun= 1):  0.8  ;  Example:  Arcturus

Spectral Type G:  Color:  White to Yellow  ;   App. Surface temperature: 5,00- 6,000 K  ;  Average Mass (The Sun= 1):  1.1  ;  Example:  Sun 

Spectral Type F:  Color: Blue to White  ;  App. Surface temperature: 6,000- 7,500 K  ;  Average Mass (The Sun= 1): 1.7  ;  Example:  Canopus

Spectral Type A:  Color: Blue  ;   App. Surface temperature: 7,500- 11,000  ;  Average Mass: 3.2  ;  Example:  Sirius 

Spectral Type B:  Color: Blue  ;  App. Surface temperature: 11,000- 25,000  ;  Average Mass: 18  ;  Example: Rigel 

Spectral Type O:  Color: Blue  ;   App. Surface temperature:  Over 25,000  ;  Average Mass: 60  ;  Example: 10_Lacertae

All Main- Sequence Stars hotter than the Sun are more luminous and larger than our Sun
and Vice-versa...

But that is only true for Main- Sequence Stars.

The other 10% of stars that are not Main- Sequence can be: Giants, Super Giants, and White Dwarfs.

Main Sequence Stars:  are all  basically undergoing Hydrogen Fusion 

Giants:  bigger and more luminous than Main Sequence stars, have left their Hydrogen Fusion state and are depleted, they will keep at fusion because of storage in their cores, but at a time of 10 to the power of 12, they will later become hydrogen white dwarfs.

Super Giants: "Supergiants can have masses from 10 to 70 solar masses and brightness from 30,000 up to hundreds of thousands times the solar luminosity. They vary greatly in radius, usually from 30 to 500, or even in excess of 1,000 solar radii. The Stefan-Boltzmann law dictates that the relatively cool surfaces of red supergiants radiate much less energy per unit area than those of blue supergiants; thus, for a given luminosity red supergiants are larger than their blue counterparts. [1]"

White Dwarfs: Very High density compared to their size (example: mass of the Sun with size of Earth) They are the remnants of a dying star, when that star has depleted all of its resources and collapses in itself it (these are the typical ones, since they are created by stars not big enough to produce a neutron star.) They stop producing heat, but start losing it, they gradually become cooler and eventually becomes a Black Dwarf -> [These are not known to exist since it takes more time to become a Black Dwarf than what the universe took to this date]

[1] - Wikipedia search Super Giants: SuperGiants 

All other information was summarized by me, to learn even more, click on the links.  :)))