No Escape: The Truth About Black Holes

1
No Escape The Truth About Black Holes

• Is a Black Hole Really a Hole?

2
The volume of a black hole is huge.
3
Correct it's a myth!      The volume of a
black hole approaches zero. As volume decreases,
density increases. Density is the relationship of
mass per unit of volume (Density Mass/Volume).
The density of a black hole affects the escape
velocity of an object even light.
4
Sorry that's a myth!      The volume of a
black hole approaches zero. As volume decreases,
density increases. Density is the relationship of
mass per unit of volume (Density Mass/Volume).
The density of a black hole affects the escape
velocity of an object even light.
5
Black holes have no mass.
6
Correct it's a myth!      Black holes have a
broad range of masses from the smallest
(miniature) to the largest (supermassive).
7
Sorry that's a myth!      Black holes have a
broad range of masses from the smallest
(miniature) to the largest (supermassive).
8
A rotating black hole may lie at the center of
our galaxy, the Milky Way
9
Sorry that's a fact!      At the core of our
Milky Way about 25,000 light-years away the
innermost stars are moving at speeds of up to 300
km/second. Maintaining such a rapid orbit would
require the gravity exerted by an object with the
mass of 2.5 million times that of our Sun. Many
astronomers argue that an object this massive and
compact could only be a black hole.
10
Correct it's a fact!      At the core of our
Milky Way about 25,000 light-years away the
innermost stars are moving at speeds of up to 300
km/second. Maintaining such a rapid orbit would
require the gravity exerted by an object with the
mass of 2.5 million times that of our Sun. Many
astronomers argue that an object this massive and
compact could only be a black hole.
11
Gravity bends light.
12
Sorry that's a fact!      Gravity can indeed
bend light. Using Einstein's Theory of
Relativity, it is possible for scientists to
predict the degree to which gravity can bend
light. During a solar eclipse, scientists observe
stars whose positions in the sky lie near that of
our Sun. Small changes in the apparent positions
of the stars allow scientists to measure solar
gravity's light-bending effect.
13
Correct it's a fact!      Gravity can indeed
bend light. Using Einstein's Theory of
Relativity, it is possible for scientists to
predict the degree to which gravity can bend
light. During a solar eclipse, scientists observe
stars whose positions in the sky lie near that of
our Sun. Small changes in the apparent positions
of the stars allow scientists to measure solar
gravity's light-bending effect.
14
Our Sun will eventually become a black hole.
15
Correct it's a myth!      Stars the size of
our Sun typically do not become black holes
because they lack sufficient mass. Our Sun would
become a black hole only if it could be squeezed
into a ball that is less than 5.8 km across. If
it were compressed to this size, its density
would be 1019 kg/m3
16
Sorry that's a myth!      Stars the size of
our Sun typically do not become black holes
because they lack sufficient mass. Our Sun would
become a black hole only if it could be squeezed
into a ball that is less than 5.8 km across. If
it were compressed to this size, its density
would be 1019 kg/m3
17
Light cannot escape from a black hole.
18
Sorry that's a fact!      The density of a
black hole results in an escape velocity that is
greater than the speed of light.
19
Correct it's a fact!      The density of a
black hole results in an escape velocity that is
greater than the speed of light
20
Black holes will pull in everything in the
universe and eventually destroy it
21
Correct it's a myth!      The gravitational
pull of the matter making up the black hole is no
greater than the gravitational pull from a
similar amount of matter distributed over a
larger area. For example, a massive star which
exerts a certain gravitational pull on another
star will continue to have the same gravitational
pull on the other star even if it becomes a black
hole
22
Sorry that's a myth!      The gravitational
pull of the matter making up the black hole is no
greater than the gravitational pull from a
similar amount of matter distributed over a
larger area. For example, a massive star which
exerts a certain gravitational pull on another
star will continue to have the same gravitational
pull on the other star even if it becomes a black
hole.
23
NASA sent a space probe into a black hole.
24
Correct it's a myth!      At present, we do
not possess the technology to send a probe to the
distances required. Further, if a probe were to
reach a black hole, it would be unable to send
back data, because like light, radio waves
which "carry" the data cannot escape from a
black hole
25
Sorry that's a myth! At present, we do not
possess the technology to send a probe to the
distances required. Further, if a probe were to
reach a black hole, it would be unable to send
back data, because like light, radio waves
which "carry" the data cannot escape from a
black hole
26
The gravity of a black hole is felt everywhere.
27
Sorry that's a fact!      The gravitational
field of any object extends to fill the entire
universe. For example, the gravity exerted by the
black hole at the center of our galaxy affects
every object in the universe. Objects far away
from the black hole are less affected by its
gravitational force than are closer objects. Thus
a girl standing on Earth which is 25,000
light-years away from that black hole would
"feel" its gravity less than she would feel the
breeze from a gnat's beating wings. In other
words, the effect of that black hole's gravity
would be negligible.
28
Correct it's a fact!      The gravitational
field of any object extends to fill the entire
universe. For example, the gravity exerted by the
black hole at the center of our galaxy affects
every object in the universe. Objects far away
from the black hole are less affected by its
gravitational force than are closer objects. Thus
a girl standing on Earth which is 25,000
light-years away from that black hole would
"feel" its gravity less than she would feel the
breeze from a gnat's beating wings. In other
words, the effect of that black hole's gravity
would be negligible.
29
The gravity that your body creates is felt
everywhere
30
Sorry that's a fact!      The gravitational
field of an object even your body extends to
fill the entire universe. In practice, however,
the influence of an object is significant only in
its immediate vicinity.
31
Correct it's a fact!      The gravitational
field of an object even your body extends to
fill the entire universe. In practice, however,
the influence of an object is significant only in
its immediate vicinity.
32
Astronomers have evidence confirming that
ordinary black holes are the gateway to worm
holes.
33
Correct it's a myth!      Wormholes exist only
in theory. That theory suggests that wormholes
are shortcuts through space and time linking two
points. People may think wormholes are real
because they saw them in science fiction movies
and television shows. People often confuse them
with black holes. Wormholes are also associated
with white holes, another cosmic object that
exists in mathematical theory, but hasn't been
observed in nature. White holes, as the theory
goes, are regions of space into which nothing can
fall.
34
Sorry it's a myth!      Wormholes exist only
in theory. That theory suggests that wormholes
are shortcuts through space and time linking two
points. People may think wormholes are real
because they saw them in science fiction movies
and television shows. People often confuse them
with black holes. Wormholes are also associated
with white holes, another cosmic object that
exists in mathematical theory, but hasn't been
observed in nature. White holes, as the theory
goes, are regions of space into which nothing can
fall.
35
End of this voyage!http//archive.ncsa.uiuc.edu/C
yberia/NumRel/BlackHoleAnat.html