English project hukic_damir_ last
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Transcript of English project hukic_damir_ last
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The Universe
Seconde F
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Order of Magnitude
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Order of Magnitude
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Order of Magnitude
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Order of Magnitude
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Order of Magnitude
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Order of Magnitude
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Order of Magnitude
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Order of Magnitude
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Order of Magnitude
1 Gm = 1 gigameter = 10^9 meters = 1 000 000 000 m
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Order of Magnitude
1 Gm = 1 gigameter = 10^9 meters = 1 000 000 000 m
1 nm = 1 nanometer = 10^(-9) meter = 0.000000001 m
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Order of Magnitude
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Order of Magnitude
Nucleus of an atom
nucleus
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Order of Magnitude
Atom
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Order of Magnitude
Bacteria
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Order of Magnitude
Humans
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Order of Magnitude
Earth
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Order of Magnitude
Sun
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Order of Magnitude
Solar System
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Order of Magnitude
Interstellar distance
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Order of Magnitude
Galaxy
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Order of Magnitude
Observable universe
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Order of Magnitude
1000 kg 1 Kg
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Order of Magnitude
1000 kg 1 Kg
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Order of Magnitude
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Order of Magnitude
Filling of space by the matter is essentially incomplete, at
both tiny (atom) and big (cosmos) scales
(essentially void around us)
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Speed of light
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Speed of light
Speed of light in vacuum is a phyical constant :
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Speed of light
Speed of light in vacuum is a phyical constant :
c = 3.10^8 m/s = 300 000 000 m/s
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Speed of light
Speed of light in vacuum is a phyical constant :
c = 3.10^8 m/s = 300 000 000 m/s
The light is composed of photons
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Speed of light
Speed of light in vacuum is a phyical constant :
c = 3.10^8 m/s = 300 000 000 m/s
The light is composed of photons
and is propagated in straight line
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Speed of light
Speed of light in vacuum is a phyical constant :
c = 3.10^8 m/s = 300 000 000 m/s
The light is composed of photons
and is propagated in straight line
A.Einstein 1879 - 1955
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Speed of light
Speed of light in vacuum is a phyical constant :
c = 3.10^8 m/s = 300 000 000 m/s
The light is composed of photons
and is propagated in straight line
Speed of light (speed of propagation) depends
only on the medium
A.Einstein 1879 - 1955
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Speed of light
Speed of light in vacuum is a phyical constant :
c = 3.10^8 m/s = 300 000 000 m/s
The light is composed of photons
and is propagated in straight line
Speed of light (speed of propagation) depends
only on the medium
speed(vacuum) = speed(air) = c = 3.10^8 m/s
speed(water) < c
A.Einstein 1879 - 1955
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Speed of light
Speed of light in vacuum is a phyical constant :
c = 3.10^8 m/s = 300 000 000 m/s
The light is composed of photons
and is propagated in straight line
Speed of light (speed of propagation) depends
only on the medium
speed(vacuum) = speed(air) = c = 3.10^8 m/s
speed(water) < c
Refraction index n :
quantity without unit
A.Einstein 1879 - 1955
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Speed of light
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Speed of light
Galilée, Romer, Cassini, Newton, Michelson..
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Speed of light
Galilée, Romer, Cassini, Newton, Michelson..
using astronomy
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Speed of light
Galilée, Romer, Cassini, Newton, Michelson..
using astronomy
The meter is the distance travelled by the light
in the void during 1/299 792 458 second
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Speed of light
Galilée, Romer, Cassini, Newton, Michelson..
using astronomy
The meter is the distance travelled by the light
in the void during 1/299 792 458 second
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Speed of light
Galilée, Romer, Cassini, Newton, Michelson..
using astronomy
The meter is the distance travelled by the light
in the void during 1/299 792 458 second
v = c (m/s)
m
s
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Speed of light
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Speed of light
d = 1m
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Speed of light
d = 1m
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Speed of light
d = 1m
s m
m/s
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Speed of light
d = 1m
s m
m/s
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Speed of light
d = 1m
d = 150 000 000 Km
s m
m/s
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Speed of light
d = 1m
d = 150 000 000 Km
s m
m/s
s km
km/s
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Speed of light
d = 1m
d = 150 000 000 Km
Even if the light of speed is great, the gigantic distances at the
cosmos scale cause delays (we don’t see things in ‘real time’)
s m
m/s
s km
km/s
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Light-year
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Light-year
A light-year is the distance travelled by the
light in vacuum during one year
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Light-year
A light-year is the distance travelled by the
light in vacuum during one year
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Light-year
A light-year is the distance travelled by the
light in vacuum during one year
m
m/s s
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Light-year
A light-year is the distance travelled by the
light in vacuum during one year
m
m/s s
1 year converted in seconds
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Light-year
A light-year is the distance travelled by the
light in vacuum during one year
m
m/s s
1 year converted in seconds
1 ly
roughly
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Light-year
A light-year is the distance travelled by the
light in vacuum during one year
The light-year (ly) is not a new unit, it’s used only because it’s
handy with the gigantic distances we have in the cosmos
m
m/s s
1 year converted in seconds
1 ly
roughly
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Light-year
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Light-year
I see dinosaurs
How far are we
from this planet?
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Light-year
I see dinosaurs
How far are we
from this planet? Extinction of the dinosaurs :
65 millions years ago
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Light-year
I see dinosaurs
How far are we
from this planet? Extinction of the dinosaurs :
65 millions years ago
The aliens are at least
65 000 000 light-years away
from us
(6.5 * 10^22 meters)
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Light-year
I see dinosaurs
How far are we
from this planet? Extinction of the dinosaurs :
65 millions years ago
The aliens are at least
65 000 000 light-years away
from us
(6.5 * 10^22 meters)
Watch far = Watch in the past
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Light-year
Questions ?
Homework