Transcript How big is the Universe?

박영동 교수
a planet(행성)
A planet
Compound
Mass: 5.9736 × 1024 kg
(태양의 0.00030%)
Mean radius: 6,371.0 km
Composition
Continental
Oceanic
silica
SiO2
60.2%
48.6%
alumina
Al2O3
15.2%
16.5%
lime
CaO
5.5%
12.3%
magnesia
MgO
3.1%
6.8%
iron(II) oxide
FeO
3.8%
6.2%
sodium oxide
Na2O
3.0%
2.6%
potassium oxide
K 2O
2.8%
0.4%
Fe2O3
2.5%
2.3%
water
H2O
1.4%
1.1%
carbon dioxide
CO2
1.2%
1.4%
titanium dioxide
TiO2
0.7%
1.4%
phosphorus pentoxide
P2O5
0.2%
0.3%
99.6%
99.9%
iron(III) oxide
Chemical composition of the crust
Formula
Total
태양, 수성, 금성, 지구, 화성, (세레스),목성, 토성, 천왕성, 해왕성, (명왕
성)
Distance
Distance
1 AU = 149,597,870.700 ± 0.003 km
≈ 8.317 light minutes ≈ 499 light-seconds
(지구에서 태양까지의 거리)
1 light-second ≈ 0.002 AU
1 light-year = 9.461×1015 m≈ 63,241 AU
1 parsec = 30.857×1015 m ≈ 206,265 AU
Structure
The four gas giants against the Sun: Jupiter, Saturn, Uranus,
Neptune (Sizes to scale, distances not to scale)
a Star
Mass: 1.9891×1030 kg (지구의 332,900 배)
태양계 전체 질량의 99.86%
Volume: 1.412×1018 km3 (지구의 1,300,000 배)
태양 자기장의 영향
composition (by mass)
Hydrogen
73.46%
Helium
24.85%
Oxygen
0.77%
Carbon
0.29%
Iron
0.16%
Sulfur
0.12%
Neon
0.12%
Nitrogen
0.09%
Silicon
0.07%
Magnesium
0.05%
The Milky Way(우리은하)
Diameter
100,000 ly
Thickness
12,000 ly(gas)
1,000 ly(stars)
Number of stars
200 to 400 billion
Oldest star
13.2 billion yrs
Mass
5.8×1011 M☉
Sun's distance to
galactic center
26,000 ± 1400 ly
Sun's galactic
rotation period
220 million yrs
(negative rotation)
Spiral pattern
rotation period
50 million years
Bar pattern
rotation period
15 to 18 million yrs
Speed relative to
the universe
590 km/s
The Universe within 5 million Light Years
The Local Group of Galaxies(국부은하군)
Andromeda Galaxy
Diameter
Volume
~ 28 billion parsecs (about 93 billion light-years).
~ 3×1080 m3.
Stars
Galaxies:
3~7 × 1022 stars.
~ 80×109 galaxies.
Density
Atoms
9.9×10−27 kg/m3
(5.9 H atoms/m3 in energy).
~ 1080 atoms.(4.6%만 원자의 형태)