Introducing 

Prezi AI.

Your new presentation assistant.

Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.

Loading…
Transcript

this means that time flies with different 'speed' in regions of different gravitional potential.

Therefore the only things which can exceed the speed of light are things with negative mass.

physicists discovered cosmological redshift of light. (which is an optical Doppler-effect.)

we have all experienced the Doppler-effect: it's the phenomenon when an ambulance passes by you with its sirens turned on. The sound you hear when it approaches is different from the one when it departs.

the very heavy radio stars, whose gravitational field is so strong that even light can't escape from them. that's why they are 'invisible'

The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole.

DO YOU NOW SEE THE LIGHT?

He explained this phenomenon with

so did Newton.

Everybody noticed at least once that apples fall from the apple tree.

the law of universal

r

g

i

a

i

n

t

v

though this theory seemed perfect to write down physical circumstances on

Earth

it was almost useless for our ancestors who looked up to the sky to understand what's really there.

o

Nothing can reach the speed of light that is heavier than photons.

The speed of light is a constant. Light consists of photons, the particles whose mass is 0.

this is something that never changes.

except the speed of light.

and then

came Einstein.

so these are the miraculous rules of our universe

he explained the same phenomenon with another theory:

2nd

the general relativity

so he will think that the 2nd star exploded first.

as he travels towards the 2nd star, he actually reaches the beam from the 2nd star first.

is quite different.

but what he sees from the inside,

1st

From different reference frames, there can never be agreement on the simultaneity of events.

who's right?

(including the

special relativity)

This is a fundamental result of special relativity:

Einstein tells us that both are correct, within their own frame of reference.

suddenly the stars explode in exactly the same time

exactly when he's half-way between two twin stars,

with your binoculars

imagine your friend now flying with his spaceship

and yourself watching him

but from an other point of view, you're the ones who actually move

as you know, the light beams from both exploding stars travel with the same speed,

mass

and you see that they reach you at exactly the same time

2

Einstein realized that matter and energy are interrelated and made the famous formula that expresses this relationship mathematically:

E = m x c

Following this logic we can easily admit that everything is relative.

energy

speed of light

interesting consequences

but what is relativity?

the theory explains...

what you see is that the world around you is moving

they realized that stars out of our galaxy all suffer redshift, therefore they get further and further from us.

which states that at the very beginning, the whole universe was a single point, with extreme density and temperature,

imagine that you're in an elevator with your friend

so they could model the

Big Bang theory

with Einstein's theory,

scientists also discovered

black holes

light also travels in time. so if we look at the stars, we can only see the past.

of space and time.

that gravity between masses results from their warping

then it started to expand rapidly (like an explosion), and the expansion is still going on for at least 13 billion years.

this is called gravitional time dilation.

this was the state of singularity, where the number of dimensions are infinite. There was no space and no time.

that gravity also effects time.

so time is an independent dimension, and with the other 3 spatial dimensions, they make up spacetime, the 4-dimensional world we live in.

Light travels 300000 kilometres/ 186000 miles in only 1 second. Nothing can move faster.

and the only thing that remains the same for every observer in the universe is the speed of light

Learn more about creating dynamic, engaging presentations with Prezi