Sunday, August 7, 2011

soon… (The Stars)


Historically, stars have been important to

civilizations throughout the world.

They have been part of religious

practices and used for celestial navigation and orientation.

Stars are formed within extended regions

of higher density in the interstellar medium,

although the density is still lower than the inside of an earthly

vacuum chamber.

When stars form in the present

Milky Way galaxy

they are composed of about 71% hydrogen

and 27% helium,

as measured by mass,

with a small fraction of heavier elements.


Monday, August 1, 2011

soon… (The Sun)



The Sun is the star at the center of the Solar System…

It is almost perfectly spherical and consists

of hot plasma

interwoven with magnetic fields.

About three quarters of the Sun’s mass

consists of hydrogen,

the rest are helium.

The Sun is currently travelling through the

Local Instellar Cloud in the

Local Bubble Zone.

The mean distance of the Sun from Earth

is approximately 149.6M km.

The distance of the Moon to the Sun

is about 150M km.



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