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Our Star
The sun is a star, a hot ball of glowing gases at the heart of our solar system. Its influence extends far beyond the orbits of distant Neptune and Pluto. Without the sun's intense energy and heat, there would be no life on Earth. And though it is special to us, there are billions of stars like our sun scattered across the Milky Way galaxy.

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Discovered By
Known by the Ancients
Date of Discovery
Unknown
Equatorial Inclination to Orbit
7.25 with respect to the ecliptic
Mean Radius
Metric: 695,508 km
English: 432,168.6 miles
Scientific Notation: 6.9551 x 105 km
By Comparison: 109.2 x that of Earth
Equatorial Circumference
Metric: 4,370,005.6 km
English: 2,715,395.6 miles
Scientific Notation: 4.37001 x 106 km
By Comparison: 109.2 x that of Earth
Volume
Metric: 1,409,272,569,059,860,000 km3
English: 338,102,469,632,763,000 mi3
Scientific Notation: 1.40927 x 1018 km3
By Comparison: 1,301,018.805 Earths
Mass
Metric: 1,989,100,000,000,000,000,000,000,000,000 kg
English: 4,385,214,857,119,400,000,000,000,000,000 lbs
Scientific Notation: 1.989 x 1030 kg
By Comparison: 333,060.402 x Earth's
Density
Metric: 1.409 g/cm3
By Comparison: 0.256 that of Earth
Surface Area
Metric: 6,078,747,774,547 km2
English: 2,347,017,636,988 square miles
Scientific Notation: 6.07877 x 1012 km2
By Comparison: 11,917.607 Earths
Surface Gravity
Metric: 274.0 m/s2
English: 899.0 ft/s2
Scientific Notation: 2.740 x 102 m/s2
By Comparison: 27.96 x Earth's surface gravity
Escape Velocity
Metric: 2,223,720 km/h
English: 1,381,756 mph
Scientific Notation: 6.177 x 105 m/s
By Comparison: 55.20 x Earth
Sidereal Rotation Period (Length of Day)
25.38 Earth days
609.12 hours
By Comparison: Rotation slows to about 35 days at the poles.
Minimum/Maximum Surface Temperature
Metric: 5,500 °C
English: 10,000 °F
Effective Temperature
Metric: 5504 °C
English: 9939 °F
Scientific Notation: 5777 K

Additional Information:

Spectral Type: G2 V Luminosity: 3.83 x 10 33 ergs/sec.

Age: 4.6 Billion Years

Composition: 92.1% Hydrogen, 7.8% Helium

Synodic Period: 27.2753 days

Rotation Period at Equator: 26.8 days

Rotation Period at Poles: 36 days

Velocity Relative to Near Stars: 19.7 km/s

Mean Distance to Earth: 149.60 million km (92.96 million mi) (1 astronomical unit)

Solar Constant (Total Solar Irradiance): 1.365 - 1.369 kW/m2
(at the mean distance of the earth from the Sun, about one AU)
Discovered By
Known by the Ancients
Date of Discovery
Unknown
Equatorial Inclination to Orbit
7.25 with respect to the ecliptic
Mean Radius
Metric: 695,508 km
English: 432,168.6 miles
Scientific Notation: 6.9551 x 105 km
By Comparison: 109.2 x that of Earth
Equatorial Circumference
Metric: 4,370,005.6 km
English: 2,715,395.6 miles
Scientific Notation: 4.37001 x 106 km
By Comparison: 109.2 x that of Earth
Volume
Metric: 1,409,272,569,059,860,000 km3
English: 338,102,469,632,763,000 mi3
Scientific Notation: 1.40927 x 1018 km3
By Comparison: 1,301,018.805 Earths
Mass
Metric: 1,989,100,000,000,000,000,000,000,000,000 kg
English: 4,385,214,857,119,400,000,000,000,000,000 lbs
Scientific Notation: 1.989 x 1030 kg
By Comparison: 333,060.402 x Earth's
Density
Metric: 1.409 g/cm3
By Comparison: 0.256 that of Earth
Surface Area
Metric: 6,078,747,774,547 km2
English: 2,347,017,636,988 square miles
Scientific Notation: 6.07877 x 1012 km2
By Comparison: 11,917.607 Earths
Surface Gravity
Metric: 274.0 m/s2
English: 899.0 ft/s2
Scientific Notation: 2.740 x 102 m/s2
By Comparison: 27.96 x Earth's surface gravity
Escape Velocity
Metric: 2,223,720 km/h
English: 1,381,756 mph
Scientific Notation: 6.177 x 105 m/s
By Comparison: 55.20 x Earth
Sidereal Rotation Period (Length of Day)
25.38 Earth days
609.12 hours
By Comparison: Rotation slows to about 35 days at the poles.
Minimum/Maximum Surface Temperature
Metric: 5,500 °C
English: 10,000 °F
Effective Temperature
Metric: 5504 °C
English: 9939 °F
Scientific Notation: 5777 K

Additional Information:

Spectral Type: G2 V Luminosity: 3.83 x 10 33 ergs/sec.

Age: 4.6 Billion Years

Composition: 92.1% Hydrogen, 7.8% Helium

Synodic Period: 27.2753 days

Rotation Period at Equator: 26.8 days

Rotation Period at Poles: 36 days

Velocity Relative to Near Stars: 19.7 km/s

Mean Distance to Earth: 149.60 million km (92.96 million mi) (1 astronomical unit)

Solar Constant (Total Solar Irradiance): 1.365 - 1.369 kW/m2
(at the mean distance of the earth from the Sun, about one AU)