 
we live in a world  that   that follows   that follows a set of laws
 
 
but the strangest thing
is that everything has a a beginning and an end
like us humans we  die in the end
but does this law apply in the whole universe
 
yes even the stars die but the become a black hole
 
albert einstein first predicted
black holes in 1916
with his general theory of realtivity
term "black hole" was coined
in 1967 by american astronomer
his name john wheleer
and the first one was discovered in 1971
the definition of black hole
the black hole an invisible area in space
with gravity so strong even light cannot escape it
because no light can escape black holes are invisible
 
Black holes can come in a range of sizes
but there are three main types of black holes
The black hole's mass and size determine what kind it is.
The smallest ones are known as
primordial black holes
Scientists believe this type of black hole is as small
as a single atom
but with the mass of a large mountain.
The most common type of medium-sized black holes
is called "stellar."The mass of a stellar black hole
can be up to 20 times greater  than
the mass of the sun
c and can fit inside a ball
with a diameter
of about 10 miles.
Dozens of stellar mass black holes may exist within
within the Milky Way galaxy.
The largest black holes are called "supermassive."
These black holes have masses greater than 1 million suns
combined and would fit
inside a ball
with a diameter about the size
of the solar system.
Scientific evidence suggests that every large galaxy
contains a supermassive black hole
at its center.
The supermassive black hole at the center of
the Milky Way galaxy
is called
Sagittarius A.
It has a mass equal to about
4 million suns
and would fit inside
a ball
with a diameter about the size of the sun.
