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Black
Holes
Fred Ikeler
Shimon Masaki
Danny Okano
Black Holes
The
intense
gravitational field left
when a giant star
collapses
It
is called a black
hole because not
even light can
escape
Photon Sphere
The
outer
edge where
light bends
but is still
escapable
Event Horizon
The
point at which
no light can escape
Singularity
The
shrunken
star too small
to be
measured but
with indefinite
density
How A Black Hole is Formed

Black holes are thought to form
from stars or other massive
objects if and when they
collapse from their own gravity
to form an object whose density
is infinite: in other words, a
singularity. During most of a
star's lifetime, nuclear fusion in
the core generates
electromagnetic radiation,
including photons, the particles
of light. This radiation exerts an
outward pressure that exactly
balances the inward pull of
gravity caused by the star's
mass.
QuickTime™ and a
decompressor
are needed to see this picture.
Why does the Star Collapse?

As the nuclear fuel is
exhausted, the outward
forces of radiation diminish,
allowing the gravitation to
compress the star inward.
The contraction of the core
causes its temperature to rise
and allows remaining nuclear
material to be used as fuel.
The star is saved from further
collapse -- but only for a
while.
QuickTime™ and a
decompressor
are needed to see this picture.
Video

Black Hole Video
How Do Scientists Find Black Holes?

A black hole cannot
be viewed directly
because light cannot
escape it. Effects on
the matter that
surrounds it infer its
presence. Matter
swirling around a
black hole heats up
and emits radiation
that can be detected.
QuickTime™ and a
decompressor
are needed to see this picture.
Who discovered black holes?

Karl Schwarzschild is credited with being the
brilliant astronomer who developed the
concept of black holes. In 1916, using
Einstein's general theory of relativity, he
began to make calculations about the gravity
fields of stars. He concluded that if a huge
mass, such as a star, were to be
concentrated down to the size of an
infintessimal point, the effects of Einstein's
relativity would get really fairly extreme.
Hubble Telescope Shots
QuickTime™ and a
decompressor
are needed to see this picture.
Death by Black Hole
Although nobody knows for sure, it has
been theorized that the human body
would be ripped/ shredded into the size
of atoms.
 Another theory is that your body would
be stretched and compressed at the
speed of light

Wrap Up






Black Holes are created when a large star
collapses on itself.
At the event horizon of a Black hole, not even
light can escape.
There are 3 parts to a black hole, Photon
sphere, Event horizon, and singularity.
Death by Black Hole probably hurts
Karl Schwarschild discovered black holes
Black holes cannot be seen, however
scientists can find them due to their immense
gravitational pull on matter around them.
Work Cited


Daniels, Brett. "Black Holes!" HEASARC: IMPORTANT
MESSAGE. 11 Feb. 2006. Web. 11 Jan. 2011.
<http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_hol
es.html>.
 Holla, Jack. "Black Hole." Wikipedia, the Free Encyclopedia.
04 Aug. 2007. Web. 11 Jan. 2011.
<http://en.wikipedia.org/wiki/Black_hole>.
 Markine, Chris. "No Escape: The Truth about Black Holes."
Amazing Space. 11 Oct. 2005. Web. 11 Jan. 2011.
<http://amazingspace.stsci.edu/resources/explorations/blackholes/lesson/index.
html>.
McGee, Mark. "ScienceDaily: Black Hole News." Science Daily:
News & Articles in Science, Health, Environment & Technology. 20
June 2008. Web. 11 Jan. 2011.
<http://www.sciencedaily.com/news/space_time/black_holes/>.