Table of Contents
- 1 When will the sun evaporate the oceans?
- 2 Will the sun become a red giant or white dwarf?
- 3 When will the sun turn into a white dwarf?
- 4 What is the solar luminosity?
- 5 How is it possible for white dwarf stars to have lower luminosity than the sun even though the sun is cooler than the white dwarfs?
- 6 Why does the luminosity of the sun increase over time?
When will the sun evaporate the oceans?
In a few billion years, the sun will become a red giant so large that it will engulf our planet. But the Earth will become uninhabitable much sooner than that. After about a billion years the sun will become hot enough to boil our oceans.
Will the sun become a red giant or white dwarf?
All stars die, and eventually — in about 5 billion years — our sun will, too. Once its supply of hydrogen is exhausted, the final, dramatic stages of its life will unfold, as our host star expands to become a red giant and then tears its body to pieces to condense into a white dwarf.
When will the oceans boil away?
around 1 billion years
But exactly when the oceans would begin to boil was hard to pin down, Smith said. Instead, this ocean vaporization could happen around 1 billion years from now, but added that there is a great deal of uncertainty in that figure, Smith added.
When will the sun turn into a white dwarf?
about 10 billion years
“The sun itself will become a crystal white dwarf in about 10 billion years.”
What is the solar luminosity?
1 L☉
Sun/Luminosity
The solar luminosity is the total power output of the Sun radiated to space. Solar irradiance, in contrast, is the total power per unit area at a distance of 1 AU (see Solar constant).
What is the luminosity of a white dwarf?
After a billion years the typical white dwarf is down to 0.001 the luminosity of the Sun.
How is it possible for white dwarf stars to have lower luminosity than the sun even though the sun is cooler than the white dwarfs?
White dwarf stars have a smaller size than the sun, also the sun is continuously generating energy while the dwarf stars can no longer generate any energy that is why the white dwarf planets have less luminosity than the sun.
Why does the luminosity of the sun increase over time?
Since its birth 4.5 billion years ago, the Sun’s luminosity has very gently increased by about 30\%. The helium “ashes” left behind are denser than hydrogen, so the hydrogen/helium mix in the Sun’s core is very slowly becoming denser, thus raising the pressure. This causes the nuclear reactions to run a little hotter.
What is the luminosity of Spica?
Spica
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Luminosity | 2,254+1,166 −768 L ☉ |
| Surface gravity (log g) | 4.15±0.15 cgs |
| Temperature | 20,900±800 K |
| Rotational velocity (v sin i) | 58.8±1.5 km/s |