# Tag Info

Accepted

### Why did the dust between the planets disappear during the birth of the solar system?

Dust happens in two ways. "Primordial dust" just condenses out of the protostellar material in the disc providing it gets cool enough and dense enough. "Second generation" dust is ...
• 146k
Accepted

### The star that created our sun

There is no single progenitor of the Sun. The material that makes up the Solar System (or at least the elements heavier than helium) were made in approximately a billion stars that lived and died ...
• 146k

### Is it possible to view the sun and moon in the sky at the same time?

It is not only possible it is exceptionally common. When the moon is nearly new (and very close to the sun) it is not visible because the glare of the sun is too bright, and when the moon is nearly ...
• 116k

### Integration of Plank curve of the Sun

There are two issues here: one of definitions and one of code. First, the value you're expecting to get here -- 1361 Watts per square meter, the solar constant -- is the total flux received from the ...
• 36k
Accepted

### How did the temperature of the solar system evolve?

There is no "nuclear flash". The approach to a stable, hydrogen-burning star is rather smooth and in fact the Sun was more luminous during its first few million years as a protostar than it ...
• 146k
Accepted

### Integration of Plank curve of the Sun

There is two issues: a) you have to use Earth distance to get the Solar constant, but you use 1pc ($10^{16}$m)instead of one astronomical unit (150 million kilometers, $1.5\cdot 10^{11}$m). That's a ...
• 17.7k

### Integration of Plank curve of the Sun

The integral of the Planck function over all wavelengths gives the surface flux at the photosphere of the Sun divided by pi. In order to get the solar constant, you should multiply this by \$\pi \times ...
• 146k
1 vote

### Is it possible to view the sun and moon in the sky at the same time?

When I was a child, I was outside during the day, I think in the backyard of our house, and I happened to look at the sky and see the Moon. I was surprised to see the Moon in the sky during the day, ...
• 7,439
1 vote

### The star that created our sun

This supernova exploded about (somewhat before) 4,568.2  million years ago (the likely age of the oldest meteorites dated to time, source). It was not the only source of the material for the Sun, but ...
• 212

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