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Space Station Info :: Space Solar System ::History of Sun

History of Sun

Space Sun

The sun is a star which is very closer to earth than any other star and appears very large and bright. Without the Sun's light and heat, there would be no life on Earth. The Sun is a ball of plasma with a mass of about 2×1030 kg. The sun is mainly composed of hydrogen and helium; it contains about 70% of hydrogen, 28% of helium and less than 2% of other metals. The outer atmosphere of sun has a temperature of over 106 K when its visible surface (the photosphere) has a temperature of just 6,000 K. Solar energy is transformed by plants into chemical energy, which is the first step in the food chain for all living things. The Sun has been around for about 4.6 billion years and is expected to keep burning bright for another 5 billion years.

w Physical Characteristics

 

Observation Data
Mean distance from
Earth
149.6×106 km
(92.95×106 mi)
(8.31 minutes at the Speed of Light)
Visual brightness (V)
-26.8m
Absolute magnitude
4.8m
Orbital Characteristics
Mean distance from
Milky Way core
2.5×1017 km
(26000 light-years)
Galactic period
2.26×108 a
Velocity
217 km/s
Physical Characteristics
Diameter
1.392×106 km
(109 Earths)
Oblateness
9×10-6
Surface area
6.09×1012 km²
(11 900 Earths)
Volume
1.41×1018 km³
(1 300 000 Earths)
Mass
1.9891×1030 kg
(332 950 Earths)
Density
1.408 g/cm³
Surface gravity

273.95 m s-2
(27.9 g)
Escape velocity
from the surface
617.54 km/s
Surface temperature
5780 K
Temperature of corona
5 MK
Core temperature
~13.6 MK
Luminosity (Lsol)
3.827×1026 W
3.9×1028 lm
or 100 lm/W efficacy
Mean Intensity (Isol)
2.009×107 W m-2 sr-1
Rotation Characteristics
Obliquity
7.25°
(to the ecliptic)
67.23°
(to the galactic plane)
Right ascension
of North pole 1
286.13°
(19 h 4 min 30 s)
Declination
of North pole
+63.87°
(63°52' North)
Rotation period
at equator
25.3800 days
(25 d 9 h 7 min 13 s) 1
Rotation velocity
at equator
7174 km/h
Photospheric Composition (by mass)
(All in the plasma state)
Hydrogen
73.46 %
Helium
24.85 %
Oxygen
0.77 %
Carbon
0.29 %
Iron
0.16 %
Neon
0.12 %
Nitrogen
0.09 %
Silicon
0.07 %
Magnesium
0.05 %
Sulfur
0.04 %

Also View about layer of sun

Layers Of Sun