Sun's surface temperature
About 5800 K / 5500°C.
Sun's core temperature
Approximately 15 million °C.
Sun's core pressure
Around 250 billion atmospheres.
Sun's main composition
75% hydrogen, 25% helium by mass.
Sun's total mass
About 2 x 10^30 kg.
Sun's diameter
Approximately 1.4 million km.
Nuclear fusion process
Nuclei combine, releasing energy.
Fusion vs chemical reactions
Fusion involves nuclei, releases more energy.
Solar system's dominant body
The Sun, with 99.9% of total mass.
Earth-Sun distance
Approximately 150 million km.
Sun's future into Red Giant
In ~5.5 billion years, diameter up to 1 billion km.
Earth's habitability timeline
Uninhabitable in ~1-1.5 billion years.
Fundamental SI unit of length
Meter (m), based on light speed.
SI unit of time
Second (s), based on cesium atom.
SI unit of mass
Kilogram (kg), based on Planck constant.
SI unit of electric charge
Coulomb (C), charge transferred by 1 A in 1 s.
SI unit of temperature
Kelvin (K), absolute zero; Celsius (°C) offset by 273.15.
Prefix 'kilo-'
Multiplier 10^3 (1,000 times).
Prefix 'milli-'
Multiplier 10^-3 (one-thousandth).
Energy content of petrol
About 33 MJ per liter.
Pon a prueba tus conocimientos con 10 preguntas sobre Stellar Energy and Measurement Fundamentals.
1. What does the Sun's surface temperature (~5800 K / 5500°C) specifically refer to?
2. Who is the author cited in the context of nuclear fusion in stars?
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