Explaining the idea of Black Holes in simple terms.

1. Presented By Edwin Makeu
Class: BCA 3, PCTE College
Presented to Mr`s Heena Kalra and BCA 3

2. Contents
1. History Of Black Holes
2. What Is a Black Hole?
3. How Big Are Black Holes?
4. How Do Black Holes Form?
5. If Black Holes Are “Black,” How Does Scientist Know
They Are There?
6. Could A Black Hole Destroy Earth?

3. History of Black Holes
• In the 18th century geologist John Michell and first mentioned the ideos of
objects with a huge gravitation, from which even light cannot escape.
• in 1915 Albert Einstein developed the thoery of general relativity
• In 2016, scientists finally detects gravitational waves that emitted from two black
holes colliding, proving that such things not only exist, but Einstein was right all
along.

4. What Is Black Hole?
• Black Hole is a place in space where
gravity pulls so much that even light
can not get out.
• The gravity is so strong because
matter has been squeezed into a tiny
space.
• Near a black hole, the slowing of the
time is extreme. Time stops. And in
the center of black hole, Einstein
thory predicts that the time is
destroyed

5. How Big Are Black Holes?
1. Scientis think the smallest black
holes are small as a atom. This Black
holes are tiny but have a mass of a
mountain
2. Steller- is a type of black holes
which has mass that can be up to
20 times more than the mass of
sun
3. Supermassive- These are
largest black holes which have
masses that are more than 1
million suns togther

6. How Do Black Holes Form?
• Black Holes are normally formed
when a star dies away
• It is believed the many current
existing black holes such as the
Stellers and Supermassive black
holes formed during the time of
Supanova when a very big star
collapse within itself and blast
throughout the space which also
leads to the formation of the
universe.

7. Observers see a
brightening of the Star or
galaxy
Black Hole
Intense gravity
bends the light ray
Light Rays
from Star
or galaxy

8. Could A Black Hole Destroy Earth?
• Black Holes do not go
around space eating stars
moons and planets.
• Earth will not fall into a
black hole because no black
hole is close to the sun

9. Thank you